Costco's $23.99 collagen, two $200 treadmills, and Vitacost's Sept. 14 cutoffs
A Sept. 7–13 scan of protein, supplement, and fitness gear deals across Costco, Amazon, iHerb, and Vitacost, with coupon stacks, deadlines, and price baselines.
Prices were checked at 9:12 a.m. ET on Sunday, Sept. 13, 2026. This week's strongest buys feature Costco's 24-ounce Vital Proteins collagen at $23.99, Amazon's Premier Protein MINIs 12-pack at $17.08 through Subscribe & Save, iHerb's 40% flash discounts on joint care and liquid minerals, and two MERACH cardio machines reduced to under $200 with promo codes. Vitacost enters an active expiration cycle, with brand-level discounts expiring Monday morning and Wednesday morning.
At a glance
| Retailer | Item or promotion | Current price | Price math | Deadline and checks | Price status |
|---|---|---|---|---|---|
| Costco | Vital Proteins Collagen Peptides · 24 oz | $23.99 | $6.00 manufacturer savings; warehouse pricing | Valid through Sept. 20; limit 3; warehouse and online prices can vary | Current flyer price; historical low unverified 1 |
| Amazon | Premier Protein MINIs · 12 × 8.75 oz | $17.08 | $18.98 list − 5% clipped coupon − 5% Subscribe & Save | Clip coupon on product page; check out with Subscribe & Save; Prime or $35+ for free shipping | Current community stack; historical low unverified 2 |
| iHerb | Animal Flex Joint Care · 44 packs | $23.97 | $39.95 reference; $15.98 saved; 40% off | Daily Flash Deal; countdown showed 2 hr 50 min remaining when checked | Current flash price; historical low unverified 3 |
| iHerb | Eidon Ionic Minerals Magnesium · 2 fl oz | $13.19 | $21.99 reference; $8.80 saved; 40% off | Daily Flash Deal; short countdown timer active on deals page | Current flash price; historical low unverified 3 |
| Amazon | Nature's Bounty B12 · 200 ct 1000mcg | $5.00 | $9.97 list − $0.98 coupon − 35% S&S coupon − 5% Subscribe & Save | Select accounts; clip both coupons on page; manage subscription after delivery | Account-targeted stack; historical low unverified 4 |
| Vitacost | Brand promotional tiers | Varies by product | 15%, 20%, 25%, and 30% automatic discounts | First tier ends Sept. 14 at 7:00 a.m. ET; main tier ends Sept. 16 at 7:00 a.m. ET | Official promotion; individual SKU price histories unlisted 5 |
| Amazon | MERACH UltraWalk W60 walking pad · 12% auto incline | $197.99 | $329.99 − $132 with promo code MRK7BTP4; 40% off | Enter code at checkout; verify seller MERACH SPORTS; free shipping | Community code lead; historical low unverified 6 |
| Amazon | MERACH T12 folding treadmill · 6% manual incline | $199.99 | $329.99 − $130 with promo code CBUIH3UE; 39% off | Enter code at checkout; verify seller MERACHFITNESS; free shipping | Community code lead; historical low unverified 7 |
The table distinguishes current promotional prices from verified historical records. None of the monitored retailers provides an authenticated long-term price series for these specific listings, leaving all-time-low status unverified across the board.
Protein and collagen: warehouse cases and shake stacks
Costco: Vital Proteins Collagen Peptides for $23.99
Costco's current member savings flyer features Vital Proteins Collagen Peptides, 24-ounce tub (item 1303463), at $23.99 after a $6 manufacturer discount. The offer is valid through Sept. 20, 2026 with a purchase limit of 3 units. 1
The 24-ounce container yields approximately 34 servings of 20 grams each, establishing a unit cost of $1.00 per ounce or roughly $0.71 per serving. Costco notes that warehouse prices, online orders, and locations in Alaska, Hawaii, and Puerto Rico carry different price baselines. Shoppers buying online should verify whether shipping surcharges apply to the final cart.
Amazon: Premier Protein MINIs 12-pack for $17.08
Amazon lists the Premier Protein MINIs 12-Pack (8.75 oz each, Vanilla) at $18.98. Clipping the 5% on-page coupon and checking out via Subscribe & Save lowers the final price to $17.08, saving $1.90. Accounts with 5 or more active subscription items qualify for a 15% tier, reducing the final total to $16.13. 2
Each bottle supplies 22 grams of protein and 130 calories. The $17.08 checkout price sets a unit rate of $1.42 per shake and approximately $0.065 per gram of protein. This pricing matches previous community deal thresholds from earlier this year. The listing provides free shipping for Prime members and on orders reaching $35.
Caution on percentage discounts: Optimum Nutrition 5-lb tub
A prominent Amazon community post highlighted Optimum Nutrition Gold Standard Whey 5LB (Vanilla Ice Cream) at $96.28, down from a listed reference of $115.00 (16% off). Community members gave the post a -40 score, pointing out that $96.28 equals $19.26 per pound. 8
Warehouse clubs routinely stock 5-pound bags of the same brand for $79.99, while community deal thresholds for bulk whey center around $10.00 to $11.00 per pound. A nominal 16% discount on Amazon leaves the final unit price well above standard bulk market rates.
The iHerb deals section displays zero standalone protein powder discounts during this cycle. Shoppers seeking bulk protein powder will find better value waiting for dedicated brand promotions or buying in-store warehouse bags.
Vitamins and joint health: flash sales and account coupons
iHerb: 40% flash deals on joint support and minerals
iHerb's Deals hub includes two daily flash discounts reaching 40% off:
- Animal Flex Comprehensive Joint Care (44 Pill Packs) drops to $23.97 from a reference price of $39.95, saving $15.98. Each pack contains joint construction, lubrication, and support complexes. 3
- Eidon Ionic Minerals Magnesium Liquid Concentrate (2 fl oz) is marked down to $13.19 from $21.99, saving $8.80. 3
Both offers carried an active countdown showing 2 hours and 50 minutes remaining at the Sunday morning check. Flash items require prompt checkout before the timer rolls over to the next daily selection.
iHerb also maintains steady discounts on house-brand staples. California Gold Nutrition Defender 4 (180 veggie capsules with vitamins C, D, zinc, and selenium) sells for $11.02 against a $14.69 list price (25% off). California Gold Nutrition High Potency B Complex (30 capsules) is priced at $7.18 versus $8.98 (20% off). 910
Amazon: Nature's Bounty B12 200-count for $5.00
A staff-verified Amazon deal offers 200-count Nature's Bounty B12 Vitamin Tablets (1000mcg) for $5.00 on select accounts. The posted savings stack starts from a $9.97 baseline: clip a $0.98 coupon under One-Time Purchase, switch to Subscribe & Save to clip a 35% coupon, and apply the 5% subscription discount. 4
The community score reached +142, with 13,400 views. User reports indicate coupon availability varies by account. Buyers missing the $0.98 coupon reported a final price of $5.98, which still provides strong value compared to the $8.72 third-party merchant baseline cited by editors.
Costco: warehouse vitamin savings without listed totals
Costco's warehouse savings book features several staple supplements with fixed dollar reductions through Sept. 20, 2026:
- Kirkland Signature Vitamin C (500 ct): Save $3.00, limit 15 1
- Kirkland Signature Vitamin B12 (300 ct): Save $4.00, limit 15 1
- Nature Made CoQ10 (140 ct): Save $8.00, limit 15 1
Costco's flyer states only the savings amount for these items. Exact shelf prices require in-warehouse confirmation or an active zip-code check on costco.com.
Home fitness equipment: two $200 treadmill options with promo codes
MERACH UltraWalk W60 walking pad for $197.99
Amazon seller MERACH SPORTS offers the MERACH UltraWalk W60 Walking Pad (model MR-T27) for $197.99 after applying promo code
MRK7BTP4 at checkout. The code cuts $132.00 from the $329.99 list price, representing a 40% discount. Shipping is free. 6Key specifications include:
- Motor: 1.25 CHP continuous / 3.5 HP peak brushless motor
- Incline: 12% motorized auto incline across 12 levels
- Capacity: 400-lb maximum user weight
- Dimensions: 16.5" × 41.3" walking belt; 67.7-lb steel frame
- Top speed: 4.0 mph, suited for desk walking and brisk exercise
The community awarded the deal a +97 score. While the Slickdeals thread carries an "expired" header tag, staff notes confirm the promotion remains active. Buyers should re-enter the code at the payment step to verify eligibility.
MERACH T12 folding treadmill for $199.99
A companion Amazon listing from MERACHFITNESS features the MERACH T12 Folding Incline Treadmill (model MR-T12) for $199.99 using promo code
CBUIH3UE. The coupon deducts $130.00 from the $329.99 regular price (39% off). 7Hardware details include a 300-lb user limit, a 16.5" × 42.5" belt with 12 shock absorbers, and 3 manual incline positions up to 6%. The unit folds hydraulically into a 49.2" × 25.6" footprint. Community feedback notes that the 16.5-inch belt width fits brisk walking and light jogging; intense runners generally prefer a 20-inch or wider running surface.
Retailer-wide promotions and expiry cliffs
Vitacost: dual expiration deadlines on top brands
Vitacost's official Coupons, Deals and Discounts page carries staggered expiration dates this week. All listed promotions apply automatically at checkout while supplies last: 5
- Expiring Monday, Sept. 14, 2026 at 7:00 a.m. ET:
- 25% off Mindhoney and Lily of the Desert
- 15% off Raw Nutrition, Levels, and Healthy Origins
- 20% off Arrowhead Mills and select gluten-free products
- Expiring Wednesday, Sept. 16, 2026 at 7:00 a.m. ET:
- 30% off top brands, including Garden of Life, Bob's Red Mill, Boiron, Andalou Naturals, and Irwin Naturals
- 20% off select NOW Foods, Nutricost, Sports Research, New Chapter, Nordic Naturals, and Jarrow Formulas
- 25% off selected top wellness brands
- Ongoing threshold: Free standard shipping on orders over $30.
Vitacost's promotions portal displays category-wide percentage cuts without individual product price histories. Shoppers should check specific product pages to verify base prices before completing their carts.
iHerb: 10% Anniversary Rewards Credit
iHerb continues its 30th Anniversary promotion through Sept. 16, 2026 at 10:00 a.m. PT (1:00 p.m. ET). Customers spending $80 or more on eligible products receive a 10% Rewards Credit, capped at $200. 3
Qualifying spend excludes taxes, shipping fees, and refunded items. Credits will be issued to customer accounts on Oct. 1, 2026 and remain valid through Oct. 31, 2026 at 11:59 p.m. PT.
Checkout order and expiry watch
- Check iHerb flash items immediately. Animal Flex ($23.97) and Eidon Magnesium ($13.19) operate on short countdown clocks. Confirm the discounted price registers in the cart before purchasing. 3
- Review Vitacost carts by Monday morning. Brands in the 15% to 25% tier (Raw Nutrition, Levels, Mindhoney) lose their automatic discount on Sept. 14 at 7:00 a.m. ET. The larger 20% to 30% tier closes Sept. 16 at 7:00 a.m. ET. 5
- Verify MERACH promo codes on Amazon. Apply code
MRK7BTP4for the W60 walking pad ($197.99) orCBUIH3UEfor the T12 treadmill ($199.99). Confirm the seller names and final totals before payment. 67 - Rebuild Amazon coupon stacks. Open the product pages for Nature's Bounty B12 and Premier Protein MINIs while logged in. Verify whether both coupons clip in your account to reach the target prices. 24
- Confirm Costco warehouse prices before Sept. 20. Vital Proteins Collagen Peptides ($23.99) and flyer vitamin discounts expire at warehouse close next Sunday. Compare local warehouse tags against online totals. 1
References
- 1Costco warehouse savings
costco.com
- 2Premier Protein MINIs deal
slickdeals.net
- 3iHerb Deals hub
iherb.com
- 4Nature's Bounty B12 deal
slickdeals.net
- 5Vitacost promotions
vitacost.com
- 6MERACH W60 deal
slickdeals.net
- 7MERACH T12 deal
slickdeals.net
- 8Optimum Nutrition 5-lb listing discussion
slickdeals.net
- 9Defender 4 product page
iherb.com
- 10B Complex product page
iherb.com
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