A $3.57 bottle of vitamin C, a $289.99 wall rack, and Costco's November book opening tomorrow
A checked Oct. 12-18, 2026 scan of protein, vitamin and fitness-gear prices at Costco, Amazon, Vitacost, iHerb and Walmart, with three prices set against an earlier post for the same product and none labeled an all-time low.
Costco's October member book, the monthly sheet of instant savings at the warehouse, ends today, Oct. 18. The November book takes over tomorrow and runs through Nov. 15, and its health spread carries more than 40 supplement and over-the-counter rows. 1
The October book's five health rows with a printed price end with it tonight. 2
Vitacost's 20% sitewide code and its 30% brand tiers both close tomorrow at 7:00 a.m. ET. 3
Prices were checked the morning of Oct. 18, 2026.
This week at a glance
| Offer | Final price | Retailer | How the price is reached | Price status |
|---|---|---|---|---|
| Nature Made Vitamin C 500 mg with rose hips, 130 caplets 4 | $3.57 | Amazon | 40% clipped coupon plus 5% Subscribe & Save | $1.82 below its April post |
| Costco Orgain Organic Protein and Superfoods, 2.7 lb 5 | $26.99 | Costco.com | 20% off the $33.99 shelf price, limit 6 | $10.00 a pound; $1 above its January price |
| Orgain 38 g grass-fed shake, 12 cartons of 14 oz 6 | $20.99 | Amazon | 25% clipped coupon plus 5% Subscribe & Save | $1.74 a carton; staff price it $21.50 under the next best |
| Micro Ingredients magnesium citrate 1,000 mg, 240 softgels 7 | $9.99 | Amazon | Listed price, from $39.99 | 17 cents a serving; no earlier post found |
| Costco November member book, supplement and OTC rows 1 | $2.50 to $15 off | Costco | Instant savings at the register, Oct. 19 to Nov. 15 | Savings only; the shelf price sets the final figure |
| Mikolo foldable wall-mounted power rack, 1,000 lb 8 | $289.99 | Walmart | Listed price, from $639.99 | $20 below its Oct. 13 post |
| MERACH W50 walking pad, 12% auto incline, 3.5 HP 9 | $189.99 | Amazon | Listing price, down from the $199.99 code price | $8 below its September post |
| FitRx SmartBell adjustable dumbbell, 52.5 lb 10 | $109; $195 a pair | Walmart | Listed price, from $199.99 | No earlier post found |
| Vitacost sitewide 20%, code OCT26SW 3 | 20% off | Vitacost | Code at checkout, until Oct. 19, 7:00 a.m. ET | The store's own markdown |
| iHerb Orgain protein bar, 12 bars of 1.41 oz 11 | $14.54 | iHerb | Automatic deal price against iHerb's reference | 44% under the reference price |
Protein powder and shakes
The cheapest powder this week comes from a warehouse club, and it is plant-based. Costco's 2.7 lb Orgain Organic Protein and Superfoods tub is $26.99, from $33.99. 5
That works out to $10.00 a pound, with a limit of six tubs and an end date of Nov. 8.
The same tub carried $25.99 in Costco's Dec. 22, 2025 to Jan. 19, 2026 book, so today's price sits $1 above its own recent floor. 12
No whey concentrate or isolate at or below $11 a pound turned up this week.
The ready-to-drink case carries the deeper percentage. Orgain's 38 g grass-fed chocolate shake, twelve 14 oz cartons, falls from $29.99 to $20.99. 6
The route is a 25% clipped coupon plus 5% Subscribe & Save, and the result is $1.74 a carton for 38 g of protein.
Slickdeals staff put the next best reputable price $21.50 higher, which is a 50.6% saving by their count.
For powder by the scoop, Vitacost discounts a select protein collection by 20% through Oct. 26 at 7:00 a.m. ET. 3
Vitamins and supplements
Nature Made's 500 mg vitamin C with rose hips is the deepest percentage cut on the list. The 130-caplet bottle starts at $6.49. 4
A 40% clipped coupon takes $2.60 off, and 5% Subscribe & Save takes another $0.32. The total lands at $3.57, or 2.7 cents a caplet.
The same bottle posted at $5.39 in April, so this price is $1.82 lower. 13
Magnesium is the other cheap bottle. Micro Ingredients packs 1,000 mg citrate into 240 softgels and sells the bottle for $9.99, from $39.99. 7
A serving is four softgels, so the bottle holds 60 servings at 17 cents each.
Costco's November book is where the supplement breadth sits. Its health pages print more than 40 supplement and over-the-counter rows, from $2.50 to $15 off. 1
Feel Good Company appears with two rows: Berberine Phytosome at $8 off and Creatine+ at $6 off, both 120-count bottles, both limited to 15. 1
Qunol takes $5 off magnesium citrate gummies, $7 off turmeric and ginger gummies and $8 off CoQ10. Its 220-count turmeric and its Brain Health Memory Plus bottle carry $10 off.
Elsewhere in the book, Natrol melatonin gummies carry $3.50 off and Schiff Move Free Advanced $5.50 off.
Refresh Optive Mega-3 eye drops, 70 vials, take $6 off with a limit of five. 1
Every one of those rows prints a dollar saving and an item number, with the shelf price left to the warehouse. That is why the table gives the book a range instead of a price.
Fitness equipment
Mikolo's foldable wall-mounted power rack is $289.99 at Walmart, from $639.99. 8
The same rack posted at $309.99 five days earlier, so this price is $20 under its own last mark. 14
The frame rates to 1,000 lb, folds flat against a wall, and ships in two packages. One buyer who installed it suggests 2x6 wood blocks at the anchor points for a little more room.
The MERACH W50 walking pad is $189.99 at Amazon. 9
It posted at $199.99 on Oct. 9 with code 6C395F37, and the listing now rings at $189.99 without the code.
That puts it $8 below the $197.99 the same machine posted in September. 15
The specs are a 12% auto incline, a 3.5 HP motor and a 400 lb capacity, on a 16.5 by 41.3 inch belt.
The cheapest gear on the list is a dumbbell. Walmart has the FitRx SmartBell at $109, from $199.99, and the pair at $195. 10
The dial covers 15 settings between 5 and 52.5 lb.
Retailer slates: Costco, Vitacost and iHerb
The October book's last day is today. Its priced health rows are Liquid I.V. 30 ct at $20.99 after $8 off, and Ensure Original 30 cartons at $28.99 after $8.50 off. 2
Glucerna 24 cartons takes $10 off, PreserVision AREDS 2 takes $8 off, and Kirkland Signature Extra Strength Energy Shot 48 ct takes $8 off. All five end tonight.
Vitacost's slate rolls in two waves, and the first closes tomorrow morning. 3
- Code OCT26SW: 20% off sitewide, to Oct. 19, 7:00 a.m. ET.
- 30% off Vibrant Health, Yogi Tea, RADIUS, Qualia and Further Food, same cutoff.
- 20% off select protein and 20% off Zesty Paws, to Oct. 26, 7:00 a.m. ET.
- 20% off Mason Natural, Triquetra Health and DERMA E, and 15% off NATURELO, also to Oct. 19.
- 15% off NeilMed and Dastony, likewise Oct. 26; 25% off WishGarden Herbs to Nov. 2.
- 20% off Reserveage Beauty and 15% off Twinlab, to Oct. 28.
Brand discounts apply at checkout with no code. The two store-wide offers need one, and free shipping starts at $30.
iHerb's deals page rotates every week, and the sports tab carries bars and creatine this cycle. 11
The Orgain protein bar, twelve 1.41 oz bars, is $14.54 against a $25.88 reference price, or $1.21 a bar.
Its powder listings, including Purely Inspired's 1.2 lb tub, show a cart-only price, so no powder figure could be checked there this week.
How each price is reached
Subscribe & Save carries most of the Amazon offers. It takes 5% off one subscription and 15% off five or more items in one delivery. 4
Clipped coupons appear only when you are signed in, and they are one-time use. Prices that depend on them can change between refreshes.
Costco applies its book savings at the register, and its online prices may run higher than warehouse prices. Each row prints its own limit per member. 1
Amazon's MERACH listing takes code 6C395F37 if the $199.99 price shows instead of $189.99. 9
Walmart's dumbbell and rack prices are the listed ones, with free shipping.
Price status: what is actually a low
Three prices beat an earlier post for the same product, and each earlier post was opened and read.
Vitamin C at $3.57 is $1.82 under its $5.39 April price. 13
The Mikolo rack is $20 under its Oct. 13 post, and the MERACH W50 is $8 under its September post. 1415
Costco's Orgain tub runs $1 above the $25.99 it carried in the January book, so it is close to its floor without matching it. 12
The magnesium citrate bottle and the FitRx dumbbell rest on the seller's own comparison price, because no earlier post for either turned up.
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
- Costco October member book: today, Oct. 18.
- Vitacost code OCT26SW and the 30% brand tiers: Monday, Oct. 19, 7:00 a.m. ET.
- Costco November member book: Oct. 19 through Nov. 15.
- Costco Orgain 2.7 lb tub: Nov. 8, or while stock lasts.
- Vitacost select protein and Zesty Paws, NeilMed and Dastony tiers: Oct. 26, 7:00 a.m. ET.
- Vitacost Reserveage Beauty and Twinlab tiers: Oct. 28, 7:00 a.m. ET.
- Amazon clipped coupons and Subscribe & Save prices: no posted end date. They hold while the coupon shows at checkout.
- Mikolo rack, MERACH W50 and FitRx dumbbell: no posted end date.
- iHerb deal prices: rotate weekly, no posted end date.
References
- 1Costco Coupon Book November 2026
daily.slickdeals.net
- 2Costco Warehouse Savings
costco.com
- 3Vitacost Coupons, Deals & Discounts
vitacost.com
- 4130-Ct Nature Made 500 mg Vitamin C Caplets\
slickdeals.net
- 5Costco Members: 2.7 Lbs. Orgain Organic Protein Powder\
slickdeals.net
- 612-Pk 14-Oz Orgain 38 g High Protein Shakes\
slickdeals.net
- 7240-Ct Micro Ingredients Magnesium Citrate Softgels\
slickdeals.net
- 8$289.99: Mikolo Foldable Wall-Mounted Power Rack\
slickdeals.net
- 9MERACH W50 Walking Pad at $189.99\
slickdeals.net
- 10FitRx 52.5 lb SmartBell Adjustable Dumbbell\
slickdeals.net
- 11iHerb Sports Deals\
iherb.com
- 12
- 13130-Count Nature Made Vitamin C 500 mg with Rose Hips
slickdeals.net
- 14$309.99: Mikolo Foldable Wall-Mounted Power Rack
slickdeals.net
- 15MERACH W50 Walking Pad at $197.99
slickdeals.net
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