A $1.78-a-bottle case that ends tonight, a 5-lb whey at $11.40 a pound, and Vitacost's Oct. 7 cutoff
A Sept. 28–Oct. 4 scan of protein, supplement and fitness-gear offers across Costco, Academy Sports, Amazon, iHerb and Vitacost, with checkout math, hard deadlines, and five prices set against an earlier post for the same product.
Prices were checked at 9:00 a.m. ET on Sunday, Oct. 4, 2026, across Costco, Amazon, iHerb, Vitacost, Academy Sports and Slickdeals' deal boards. Two deadlines land inside the next three days, and both are easy to miss: a Costco warehouse price on an 18-pack of protein shakes closes tonight, and Vitacost's 20%-off-supplements code closes Wednesday morning.
Three prices below stand against an earlier post for the same product that is still online, and two more carry the deal poster's own note that the price matches or beats a previous frontpage deal. The rest rest on the comparison the seller prints, which tells you what changed this week rather than whether the price is good. Each row says which kind it is.
At a glance
| Retailer | Item or promotion | Current price | Price math | Deadline and gates | Price status |
|---|---|---|---|---|---|
| Costco | Fairlife Nutrition Plan 30g shake, 18 × 11.5 oz | $31.99 | An $8 manufacturer saving; $1.78 a bottle | Ends tonight, Oct. 4; in-store only; limit 3; item 1485984 | Matches the ~15¢-an-ounce price of an earlier frontpage post 1 |
| Academy Sports | Optimum Nutrition Gold Standard 100% Whey, 5 lb | $56.99 | $71.99 less a $15 new-member code; $11.40 a pound | Code arrives by email after signing up; free shipping; no shipping to California | Above its own post: the same 5 lb tub was posted at $51.99 on June 8 2 |
| Amazon | Oath Nutrition Clear Whey Isolate, 18 servings | $22.79 | $23.99 less 5% Subscribe & Save; 15% Subscribe & Save takes it to $20.39 | No stated end; Subscribe & Save required | Seller comparison only |
| Amazon | Double Wood Magnesium Glycinate 400 mg, 180 ct | $8.36 | $13.95 less a 30% clipped coupon and 10% Subscribe & Save | Coupon is account-gated and typically one use | Below its own posts: $12.55 on May 21, and $8.37 and $8.69 posted since 3 |
| Amazon | Sports Research Wild Alaskan Cod Liver Oil, 120 ct | $13.47 | $22.46 less a 30% clipped coupon and 10% Subscribe & Save | Coupon is account-gated | Seller comparison only |
| Amazon | Nature Made Turmeric Curcumin 500 mg, 120 ct | $7.58 | $13.79 less a 40% clipped coupon and 5% Subscribe & Save | Select accounts only | Matches its own recent frontpage price 4 |
| Amazon | iMATCHME Magnesium Glycinate with L-Theanine, 120 ct | $15.45 | A clipped coupon plus code PQ9ZDDXZ | Code is one use; no stated end | Seller comparison only |
| Vitacost | 20% off supplements, code OCT26SUPPS | 20% off | Applies to the supplement collection at checkout | Ends Wednesday, Oct. 7, 7:00 a.m. ET; free shipping over $30 | Brand-level percentage only; the page prints no product prices |
| iHerb | Deals page, item by item | Varies | Listed price against iHerb's own reference price | While listed; free shipping at $30 | Seller's own reference price |
| Amazon | Sportsroyals PT1 10-in-1 power tower with code TN3U3CSS | $103.94 | $134.99 less $31.05 with the code | Log in to apply the code; no stated end | Below its own post: $109.34 on Aug. 15 5 |
| Costco.com | Kingsmith StairGo stair climber | $299.99 | A $140 manufacturer saving | Valid Sept. 24–Oct. 11; limit 5; free shipping | Seller comparison only |
Protein: a warehouse case closing tonight, and the cheapest bulk powder of the week
Costco: 18 Fairlife shakes for $31.99, in the store, through tonight
Costco has the 11.5-ounce Fairlife Nutrition Plan shake in chocolate or vanilla, eighteen to a case, at $31.99 after an $8 manufacturer saving — $1.78 a bottle, and about 15 cents an ounce. The saving runs Sept. 28 through Oct. 4, so today is the last day, and the case is capped at three per member. 1
The offer is in-store only, which is the part that decides whether you can use it. Costco's own app settles that: open Warehouse, search warehouse inventory, and enter item 1485984. The poster of the deal reports the shelf price at $31.99 to $31.98 after the discount, and the deal's own note says the per-ounce price matches a previous frontpage post for the same case. 1
Commenters on the thread put the same shake at $1.77 a bottle in the warehouse and note that the delivery version lands nearer $2.16 a bottle once the missing $5 stack is taken into account, so the in-store route is the one that hits the advertised number. One recurring objection on the thread is worth knowing before you buy a case: this shake is sweetened with sucralose. 1
Academy Sports: 5 pounds of Optimum Nutrition whey for $56.99
Bulk powder is the harder half of this category, and this week's cheapest per-pound option comes from Academy Sports. A 5-pound tub of Optimum Nutrition Gold Standard 100% Whey in Double Rich Chocolate or Vanilla Ice Cream lists at $71.99, and a $15 welcome code for a new myAcademy Rewards account takes it to $56.99, with free shipping — $11.40 a pound. 2
The post scored +119 and drew 88 comments and 36,900 views, which is real backing. Three gates decide whether $56.99 is available to you. The code arrives by email after you sign up and can take a while, Academy does not ship to California, and one commenter reports the code arriving as $15 off $15 rather than $15 off the tub. Slickdeals' editors measured the offer $28.50, or 33%, below the next best merchant they could find, which they put at $85.49. 2
$11.40 a pound is competitive, and it sits above this tub's own history. The same 5-pound Gold Standard was posted at $51.99 on June 8, 2026, through a 30% Subscribe & Save tier on Amazon that appeared on one flavor only, and that post is marked expired. 6 One commenter on this week's thread frames the buying decision plainly: with whey prices where they are, anything under a dollar a serving counts as a good buy. A 5-pound tub at $56.99 works out to about $1.15 a serving.
Amazon: Oath Nutrition Clear Whey Isolate, 18 servings for $22.79
For a lighter powder, Amazon has Oath Nutrition's Clear Whey Isolate in Frosty Lemonade, 18 servings, at $23.99, and 5% Subscribe & Save takes it to $22.79. Adding the tub to an existing Subscribe & Save order of five or more items lifts the tier to 15% and brings it to $20.39. 7
At $22.79 for 18 servings the powder costs about $1.27 a serving, so it loses to the Academy tub on price per serving and wins on format if a milky shake is what you have been avoiding. The post is new and thin — no comments and a few hundred views as of this morning — and it states no end date.
Vitamins and supplements: one bottle at its floor, and one to read past
Double Wood magnesium glycinate, 180 capsules for $8.36
Double Wood's magnesium glycinate, 400 mg a capsule and 180 capsules to the bottle, lists at $13.95. A 30% coupon clipped on the product page, then 10% off for checking out through Subscribe & Save, brings it to $8.36 with free shipping on Prime or on orders of $35 or more. 3
This bottle has a price record you can check. The same 180-count Double Wood magnesium glycinate was posted at $12.55 on May 21, 2026, through the same Subscribe & Save route, and the offer's own editor note puts this week's price $2.65 below a frontpage deal from May. Earlier posts of the same 180-count bottle have shown $8.69 and $8.37. At $8.36, this is the bottom of that range — six months of capsules for about 5 cents a day. 38
Two practical notes come from the thread itself. The coupon was visible on some accounts and not others, and one Prime member reported seeing the 30% tier only as a Subscribe & Save option. Separately, the label's "400 mg" counts the magnesium glycinate compound, of which about 60 mg is elemental magnesium; a commenter points out that NOW Foods' magnesium glycinate with BioPerine carries 100 mg of elemental magnesium a tablet at about $15 for 180. Per dollar of magnesium you actually absorb, the more expensive bottle can win. 3
Sports Research cod liver oil, 120 softgels for $13.47 — with a catch
Sports Research's Wild Alaskan Cod Liver Oil, 1,000 mg softgels, 120 to the bottle, lists at $22.46. A 30% coupon plus 10% off through Subscribe & Save brings it to $13.47, or about 11 cents a softgel, with the editors measuring it $11.48, or 46%, below the next best merchant. 9
Read the label before you treat this as a cheap fish oil. The commenters who did the arithmetic say each softgel carries about 60 mg of EPA and 45 mg of DHA alongside 300 mcg of vitamin A and 10 mcg of vitamin D3. Ten softgels would be needed to reach roughly 1,000 mg of combined EPA and DHA, and those ten would also deliver about 10,000 IU of vitamin A. Anyone buying fish oil for heart or brain health should compare it against a concentrated omega-3 instead, where a single capsule can carry 690 mg of EPA and 260 mg of DPA. The thread also reports a purchase limit of one. 9
Nature Made turmeric curcumin, 120 capsules for $7.58, on select accounts
Amazon lists Nature Made's 500 mg turmeric curcumin, 120 capsules, at $13.79. A 40% coupon clipped on the page, then 5% off through Subscribe & Save, brings it to $7.58, with free shipping on Prime or on $35 or more. 4
The gate is the word select accounts in the post's title, and the deal's own note says the price matches its recent frontpage deal. The editors put it $6.21 below the next best price they found. If the coupon does not appear on your account, the same 500 mg volume is on sale at Costco this month for $3.50 off. 10
iMATCHME magnesium glycinate with L-theanine, 120 capsules for $15.45
A smaller brand, and a thinner post. iMATCHME's magnesium glycinate with L-theanine, chamomile and GABA, 120 capsules, comes to $15.45 when you clip the coupon on the product page and enter code
PQ9ZDDXZ at checkout. 11The post has no comments and 616 views, and the seller's list price is the only comparison attached to it, so there is nothing here to check the price against. The code is single-use.
Warehouse clubs: week three of Costco's October book
The member book that opened Sept. 21 runs to Oct. 18, and it looks the way it did on day one: a handful of health rows print a full warehouse price, and the supplement pages print a dollar saving on its own. 10
The rows with a price are the ones you can rank. Ensure Original Nutrition Shake, 30 cartons of 8 fluid ounces, sits at $28.99 after $8.50 off, limit six. Glucerna Shake, 24 cartons, carries $10 off. Kirkland Signature's Extra Strength Energy Shot, 48 count, carries $8 off with a limit of 15. Liquid I.V. Hydration Multiplier, 30-count bags, holds at $20.99 after $8 off with a limit of four. 10
Everything else in the pharmacy section prints a saving and no shelf price, so it stays a list rather than a ranking — you would have to read the tag in the warehouse to know what the number is. This month's savings run from $2.50 to $10 and cover about seventy supplements and over-the-counter medicines:
- $9–$10 off: Neuriva Brain, Qunol Liquid CoQ10, Qunol Liquid Turmeric, youtheory Total Body Turmeric, youtheory Collagen
- $8 off: Nature Made CoQ10, Bausch + Lomb PreserVision AREDS 2
- $7 off: Sports Research Magnesium L-Threonate, Force Factor Hair Growth Accelerator
- $6–$6.50 off: Osteo Bi-Flex Triple Strength, Bausch + Lomb Ocuvite 50+, Culturelle Digestive Daily, Sports Research Omega-3 Fish Oil, Sports Research L-Theanine, youtheory Ashwagandha, Emergen-C, Mucinex cold and flu
- $5–$5.50 off: Nature Made CholestOff Plus, Nature's Bounty B-12, Nature's Bounty Sleep³, Weider Red Yeast Rice Plus, Estroven Complete, Vicks DayQuil + NyQuil
- $4.50 off: Advil, Aleve, Tylenol, Excedrin Migraine, Centrum Silver Men and Women 50+, Nature Made Magnesium Citrate
- $4 off: One A Day Men's and Women's, SmartyPants Kids, trunature probiotics, Nature's Bounty Hair Skin & Nails, Nature's Bounty Immune 24 Hour+, Airborne, Breathe Right, Caltrate
- $3.50 off: OLLY multis and OLLY Sleep, Nature Made Vitamin D3 in tablets and gummies, Nature Made Super C, Kirkland Signature Fish Oil, Zarbee's
- $2.50–$3 off: Nature Made Iron, Nature's Bounty Zinc, Kirkland Signature Severe Cold & Flu, Bengay, Children's Motrin, Tylenol Children's 10
Two things are missing from this book, and both have been missing since it opened. There is no protein powder in it at all — the only powder-shaped protein on the health pages is Ensure and Glucerna, which are meal-replacement shakes. And there is no fitness equipment, beyond what Costco.com sells separately. Costco also prints that warehouse, online, Business Center and Alaska, Hawaii and Puerto Rico prices can differ, so the shelf tag is the number that counts. 10
Retailer promotions: a hard Wednesday cutoff, and iHerb's item prices
Vitacost: 20% off supplements through Wednesday morning
Vitacost's current slate hangs on one code.
OCT26SUPPS takes 20% off supplements and expires Wednesday, Oct. 7 at 7:00 a.m. ET. The discount applies at checkout, and shipping is free over $30. 12Four brand tiers sit alongside it. Two close on Monday, Oct. 5 at 7:00 a.m. ET: 25% off Qualia and 15% off Oregon's Wild Harvest. Two run much longer: 20% off select non-GMO items to Oct. 19, and 20% off Zesty Paws to Oct. 26. A further pair stretches to Oct. 28: 20% off Reserveage Beauty and 15% off Twinlab, and 15% off NeilMed and 15% off Dastony both run to Oct. 26. 12
The page prints brand-level percentages and no product prices, so a percentage here tells you what will come off at checkout and nothing about whether the starting price is good. Check the specific bottle first.
iHerb: item-level prices, and one powder that loses on price
iHerb's deals page is the one retailer route that prints a current price against the site's own reference price, item by item. 13
- California Gold Nutrition Ashwagandha, 500 mg, 120 veggie capsules — $11.49 against a $15.32 reference, 25% off
- California Gold Nutrition Foods Variety Pack Snack Bars, 12 bars — $14.31 against $20.44, 30% off
- Vitacost Everyday Essentials Omega-3 Fish Oil, 1,000 mg, 150 softgels — $7.18 against $9.57, 25% off
- California Gold Nutrition Magnesium Chelate with Calcium, 270 tablets — $16.19 against $24.91, 35% off
- California Gold Nutrition CoQ10, 100 mg, 30 veggie softgels — $5.83 against $7.78, 25% off 13
Those reference prices are iHerb's own, so each percentage shows what changed rather than what the item has sold for. The one standalone protein powder on iHerb's sports deals this week is EVLution Nutrition Stacked Protein, 5 pounds, at $67.49 against a $74.99 reference — $13.50 a pound, about $2.10 a pound more than this week's Academy tub. 14
Home fitness equipment
Sportsroyals PT1 power tower, $103.94, below its August price
The PT1 10-in-1 power tower and dip station carries a 360-pound load rating, eight height settings from 57 to 83 inches, and a padded backrest. Amazon lists it at $134.99, and promo code
TN3U3CSS takes $31.05 off for $103.94 with free shipping. The post scored +8 across 15,000 views. 5This machine has a price to compare against. The same model number, 92-5501-001, was posted at $109.34 on Aug. 15, 2026, with a different code, and the current post's own note puts it $5.40 below that August frontpage deal. $103.94 is the lowest this tower has been posted at on this board. 15
The caveat is that the code is what creates the price, and codes on this board expire. Log in to apply it, and check the total before paying.
Kingsmith StairGo stair climber, $299.99 at Costco.com
Costco.com has the Kingsmith StairGo stair climber at $299.99, down from $439.99 on a $140 manufacturer saving that runs Sept. 24 through Oct. 11, limited to five per member, with free shipping. The machine folds flat into three sections, uses magnetic resistance with adjustable levels, and has a Bluetooth LCD display and transport wheels. 16
The post drew a +8 score, 3,100 views and no comments, and carries only the seller's comparison, so there is no earlier posted price to measure $299.99 against. The Oct. 11 date is the part that matters: it is a real deadline, and it falls a week from today.
Expiry watch
Tonight, Oct. 4 — Costco, in the warehouse. The $8 manufacturer saving on the Fairlife 18-pack ends with today's store hours, and the price is in-store only. 1
Monday, Oct. 5, 7:00 a.m. ET — Vitacost. The Qualia 25% tier and the Oregon's Wild Harvest 15% tier close at that hour. That is 6:00 a.m. Central, 5:00 a.m. Mountain and 4:00 a.m. Pacific. 12
Wednesday, Oct. 7, 7:00 a.m. ET — Vitacost. Code
OCT26SUPPS and its 20% off supplements end here, which is the deadline most likely to slip past you. 12Sunday, Oct. 11 — Costco.com. The $140 saving on the Kingsmith stair climber closes, and the limit is five per member. 16
Sunday, Oct. 18, and Sunday, Oct. 26 — Costco and Vitacost. The October member book runs to Oct. 18. Vitacost's Zesty Paws, NeilMed and Dastony tiers run to Oct. 26, and the non-GMO tier to Oct. 19. 1012
Open-ended, at Amazon. Every Amazon offer above states no end date, and the coupon and code mechanics are what end them. A clipped coupon is usually one use and shows on some accounts and not others, so the cart total at the moment you check out is the only deadline that holds. 2359
What to do with this list
If you are stocking protein, the two moves are Costco's in-store case today at $1.78 a bottle, and the Academy tub at $11.40 a pound whenever the welcome code lands. If you are stocking supplements, the Double Wood magnesium at $8.36 is the one price here sitting at the bottom of its own range, and the rest are ordinary coupon prices you can catch again.
Where to start: today, the Costco warehouse, if a case of shakes is useful to you. By Wednesday morning, Vitacost, if a brand tier or the 20% code does something for your cart. Any time in the next week, the Academy signup, since that code takes time to arrive and the offer has no stated end.
How to read the prices in this issue
Three entries carry a comparison against an earlier post for the same product that I opened and read: the Double Wood magnesium at $8.36 against $12.55 on May 21, the Academy whey at $56.99 against $51.99 on June 8, and the Sportsroyals tower at $103.94 against $109.34 on Aug. 15. 6815
Two more carry the deal poster's own note that the price matches or beats an earlier frontpage deal: the Costco Fairlife case and the Nature Made turmeric. Those notes are the poster's, not a price series I read. 14
Everything else rests on a comparison the seller supplies: Amazon's list price against a clipped coupon, Academy's list price against a one-time signup credit, Vitacost's brand percentages, iHerb's own reference prices, and Costco's warehouse price against its instant saving. Each of those tells you what changed this week. A verified record of what these products have sold for over months, which is what a claim about a historical low would need, was missing from every source reachable this week. 39101213
References
- 1Costco Fairlife deal
slickdeals.net
- 2Academy Optimum Nutrition deal
slickdeals.net
- 3Double Wood magnesium deal
slickdeals.net
- 4Nature Made turmeric deal
slickdeals.net
- 5Sportsroyals PT1 deal
slickdeals.net
- 6Prior Optimum Nutrition deal
slickdeals.net
- 7Oath Nutrition deal
slickdeals.net
- 8Prior Double Wood deal
slickdeals.net
- 9Sports Research cod liver oil deal
slickdeals.net
- 10Costco warehouse savings
costco.com
- 11iMATCHME magnesium deal
slickdeals.net
- 12Vitacost promotions
vitacost.com
- 13iHerb Deals
iherb.com
- 14iHerb sports deals
iherb.com
- 15Prior Sportsroyals PT1 deal
slickdeals.net
- 16Kingsmith StairGo deal
slickdeals.net
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