A $2.19 bottle of vitamin D, a $77.99 five-pound whey isolate, and Vitacost's Monday cutoff
A checked Oct. 5-11, 2026 scan of protein, vitamin and fitness-gear prices at Amazon, Costco, iHerb, Vitacost and Slickdeals, with two prices set against an earlier post for the same product and none labeled an all-time low.
Amazon's Prime Big Deal Days ran Oct. 6 and 7 this year, and it has closed. 1
Every Amazon price below is a leftover from that event, and the seller can pull it at any hour.
Costco's October member book runs through Oct. 18. 2
Vitacost's 25%-off brand tier ends Monday, Oct. 12, at 7:00 a.m. ET. 3
Prices here were checked the morning of Oct. 11, 2026.
This week at a glance
| Offer | Final price | Retailer | How the price is reached | Price status |
|---|---|---|---|---|
| Nature Made Vitamin D3, 1,000 IU liquid softgels, 100 ct 4 | $2.19 | Amazon | 40% off at checkout plus 5% Subscribe & Save | Below its own earlier $2.90 front-page price |
| Nature Made Extra Strength Vitamin C, 1,000 mg, 100 ct 5 | $4.69 | Amazon | 40% clipped coupon plus 5% Subscribe & Save, select accounts | Below this item's previous front-page deal |
| Sports Research 160 mg Magnesium Glycinate 6 | $9.69 for 90 ct; $16.17 for 180 ct | Amazon | 30% clipped coupon plus 10% Subscribe & Save | The 90-count repeats an earlier posted price; the 180-count is cheaper per capsule |
| Sports Research 12 mg Astaxanthin, 60 softgels 7 | $14.55 | Amazon | Clipped coupon plus Subscribe & Save | Matches an earlier post; it sold for $10.80 earlier this year |
| California Gold Nutrition Resveratrol Complex, 60 veggie capsules 8 | $7.72 | iHerb | Automatic discount against iHerb's own reference price | 25% under the reference price |
| ProMix Nutrition Whey Isolate, 2.5 lb two-pack, 5 lb total 9 | $77.99 | Amazon | 10% coupon plus 15% Subscribe & Save | $0.49 an ounce; the poster calls that low for an isolate |
| Premier Protein Almondmilk plant-based shake, 12 cartons of 11.5 oz 10 | $21.65 | Amazon | 5% Subscribe & Save | $1.80 a carton |
| Mikolo Multi-Functional Squat Rack with Lat Pulldown, 1,200 lb 11 | $294.99 | Walmart, via Mikolo Fitness | Listed price | $5 above its lowest posted price |
| Mikolo M11 Smith Machine Home Gym, 2,200 lb 12 | $719.99 | Walmart | Listed price | Below its earlier $739.99 post |
| CAP 150-lb rubber-covered hex dumbbell set with vertical rack 13 | $112.67 | Amazon | Listed price | $0.68 above its posted floor |
| MERACH W50 walking pad, 12% incline, 3.5 HP 14 | $199.99 | Amazon | Listed price | $2 above the previous W50 post |
Protein powder and shakes
The ProMix Nutrition whey isolate two-pack is $77.99 at Amazon, from a $103.99 sale price. 9
That works out to $0.49 an ounce for five pounds of isolate. Four flavors qualify: vanilla, chocolate, strawberry milk and unflavored.
The stack needs a 10% coupon plus 15% Subscribe & Save. Subscribe & Save reaches 15% only with five items in one delivery.
The poster writes that $0.55 an ounce is low for whey isolate in October 2026. No earlier post for this line turned up, so treat the claim as the seller's own.
No standard whey concentrate at or below $11 a pound was live during this scan. Two sub-$11-a-pound powders posted Oct. 6 were already expired by Oct. 11.
Those two were Orgain Organic Vegan Protein, 2.03 lb at $20.40, which is $10.05 a pound, 15 and Garden of Life Raw Organic, 1.46 lb at $7.89, which is $5.40 a pound. 16
For ready-to-drink, the Premier Protein almondmilk plant-based case is $21.65 at Amazon with Subscribe & Save, down from $31.99. 10
That is $1.80 a carton. A chocolate version posted at $16.42 four days earlier, so compare both listings before buying.
Vitamins and supplements
Vitamin D3 is the week's deepest cut. Nature Made's 1,000 IU liquid softgels, 100 count, come to $2.19 at Amazon. 4
The route is $3.99, minus a 40% checkout discount and 5% Subscribe & Save. At 15% Subscribe & Save it falls to $1.79.
An earlier front-page deal ran the same 100-count bottle at $2.90 and drew a deal score of 154. 17
Vitamin C pays a similar way. Nature Made Extra Strength 1,000 mg, 100 tablets, lands at $4.69 at Amazon. 5
The math: $8.53, less a 40% clipped coupon and 5% Subscribe & Save. Slickdeals prices the next-best reputable offer at $12.14 and calls this lower than the item's previous front-page deal.
Both coupons show only when you are signed in to a qualifying Amazon account. They are one-time use and can vanish between refreshes.
Sports Research magnesium glycinate is $9.69 for 90 capsules and $16.17 for 180 at Amazon. 6
The 90-count has posted at $9.69 before, so that figure is a repeat. 18
Buy the 180-count instead. It runs about 9 cents a capsule against 10.8 cents for the small bottle.
Sports Research astaxanthin, 12 mg, 60 softgels, is $14.55 at Amazon from $26.95. 7
That matches an earlier post for the same bottle. The same listing ran at $10.80 earlier this year, so this is a fair price and not the floor. 19
Creatine is the cheapest per serving on this list. NatureBell's micronized monohydrate, 2.2 lb and 200 servings, is $20.48 with Subscribe & Save, from $34.95. 20
iHerb's deals page is worth a look for anything on this list you missed. It carries current prices beside iHerb's own reference price, item by item. 8
Three that qualify this week: Resveratrol Complex, 60 capsules, at $7.72 against $10.30; children's chewable vitamin C with bioflavonoids, 90 tablets, at $6.53 against $8.71; and Curcumin 95, 30 capsules, at $7.70 against $10.27.
Every one of those is 25% off. The reference price is iHerb's own, so the percentage measures the retailer's markdown from that figure.
Fitness equipment
The Mikolo multi-functional squat rack with a lat pulldown is $294.99 at Mikolo Fitness through Walmart, from $459.99. 11
The same 1,200-lb rack has posted at $289.99 and $303.99 before. 21 This price sits $5 above its own floor.
The Mikolo M11 Smith Machine Home Gym is $719.99 at Walmart, below its earlier post of $739.99. 1222
The M11 adds a functional trainer, cable crossover and lat pulldown station to the 2,200-lb frame. Walmart lists it at $759.99, so confirm the $20 drop at checkout.
CAP's 150-lb rubber-covered hex dumbbell set with a vertical rack is $112.67 at Amazon, from $249.99. 13
Earlier posts put the same set at $111.99 with a promo code and between $139.99 and $149.99 without one. 23 That puts this price 68 cents off the low.
The MERACH W50 walking pad with a 12% auto incline and 3.5 HP motor is $199.99 at Amazon, from $399.99. 14
The W50 posted at $197.99 earlier in September, and the lighter W50 Lite went to $150 in late September. 24 Two dollars separate this from the earlier price.
Also live: the HTM vibration plate at $46.23 with code A78JFS5W. 25
The same plate posted at $38.90 on Oct. 3 and at $37.99 in late August, so today's code carries it about $7 above its recent floor. 26
Retailer slates: Vitacost and Costco
Vitacost has 25% off about forty brands until Monday morning. 3
The protein names in that tier are Kaged, Raw Nutrition, Force Factor and Sprout Living. Nutrex Hawaii, Om Mushrooms, New Chapter, Miracle Noodle and BodyBio sit alongside them.
Vitacost applies these at checkout with no code. The cutoff is Oct. 12 at 7:00 a.m. ET, and free shipping starts at $30.
Two codes run longer, to Oct. 14 at 7:00 a.m. ET. OCT26HB takes 20% off iHerb brands and OCT26DRB takes 20% off Doctor's Best.
Beyond that: select non-GMO items are 20% off to Oct. 19; Zesty Paws 20%, NeilMed 15% and Dastony 15% run to Oct. 26; Reserveage Beauty 20% and Twinlab 15% run to Oct. 28.
Costco's October member book carries no protein powder and no fitness equipment. 2
Five health rows in the book carry a full price. Liquid I.V. Hydration Multiplier, 30 ct, is $20.99 after $8 off, items 2049359, 2049358 and 1932071, limit 4.
Ensure Original Nutrition Shake, 30 cartons of 8 fl oz, is $28.99 after $8.50 off, item 1252365, limit 6. Glucerna Shake, 24 cartons, carries $10 off, item 555744, limit 15.
Bausch + Lomb PreserVision AREDS 2 carries $8 off, item 1148964, limit 5. Kirkland Signature Extra Strength Energy Shot, 48 ct, carries $8 off, item 1711799, limit 15.
Costco's pharmacy section prints a dollar saving on its own for roughly 70 supplements and OTC medicines, from $2.50 to $10. Those rows carry no shelf price, so they cannot be ranked against each other.
Costco's pharmacy page loaded as an empty shell during this scan, so the Buy More, Save More stacking terms could not be re-checked. Apply them only after a warehouse or checkout shows the current terms.
How each price is reached
Subscribe & Save is the lever under most of Amazon's offers here. It takes 5% off a single subscription and 15% off five or more items in one delivery.
Coupons marked select accounts appear only when you are signed in, and they are single-use. The 40% Vitamin D3 discount applies to a first order.
Vitacost's brand discounts need no code; its two store-wide codes do. Costco's book savings apply automatically at the register.
Price status: what is actually a low
Two prices this week beat an earlier posted price for the same product, and both earlier posts were opened and read.
Vitamin D3 at $2.19 is below its own $2.90 front-page price, 17 and Slickdeals prices the Vitamin C deal below that item's previous front-page deal. 5
Five more sit at or above their earlier posted price. The magnesium 90-count repeats $9.69, and the astaxanthin repeats $14.55 against a $10.80 price from earlier this year.
The squat rack is $5 above its floor, the dumbbell set is 68 cents above $111.99, and the walking pad is $2 above $197.99. Each of those is a fair buy rather than a new low.
No retailer or community source consulted here keeps a long-term all-time-low price series. Nothing in this edition is labeled an all-time low for that reason.
Expiry watch
- Vitacost 25%-off brand tier: Monday, Oct. 12, 7:00 a.m. ET.
- Vitacost codes OCT26HB and OCT26DRB: Wednesday, Oct. 14, 7:00 a.m. ET.
- Costco October member book: Sunday, Oct. 18.
- Vitacost select non-GMO 20% off: Monday, Oct. 19, 7:00 a.m. ET.
- Amazon select-account coupons and Subscribe & Save prices: no posted end date. The price holds only while the coupon shows at checkout.
References
- 1
- 2Costco Warehouse Savings
costco.com
- 3Vitacost Coupons, Deals & Discounts
vitacost.com
- 4100-Ct Nature Made Vitamin D3 Liquid Softgels at Amazon\
slickdeals.net
- 5
- 6
- 7
- 8iHerb Deals\
iherb.com
- 9ProMix Nutrition Whey Isolate Powder 2.5 lb Pack of 2\
slickdeals.net
- 10
- 11
- 12Mikolo M11 Smith Machine Home Gym Power Rack\
slickdeals.net
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25Amazon HTM Vibration Plate Exercise Machine 46.23 w Code
slickdeals.net
- 26HTM Vibration Plate Exercise Machine 38.90
slickdeals.net
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