Provisional conclusion VERDICT: NEGOTIATE — do not buy at $11 yet The spreadsheet margin looks acceptable, but the risk-adjusted margin is too thin for a blind 200-unit grocery purchase. Under a reasonable Q4 stress case, the Buy Box only needs to fall about 6.7%, from $24.99 to roughly $23.33, before the deal drops below your 30% ROI requirement. The exact brand, ASIN/UPC, packaged dimensions, Amazon-measured weight, expiration date, and seller history are missing. Any one of those could turn this from profitable to unsellable. 1. Fee math Conservative size assumption I would not underwrite this as small standard based solely on “8 oz box.” Amazon small standard requires a shortest side of no more than 0.75 inch, and large-standard fees can use the greater of unit weight or dimensional weight. A 30-count drink-mix box is likely thicker than 0.75 inch, and “8 oz” may describe net contents rather than Amazon’s packaged shipping weight. Amazon Seller Central +1 Therefore, I am using: Large standard 8+ to 12 oz shipping-weight band Sale price between $10 and $50 Estimated package dimensions of 6 × 4 × 3 inches for storage only Amazon’s 2026 large-standard fee in that weight and price band is approximately $4.20, before the current 3.5% fuel and logistics surcharge. Amazon Seller Central +1 Amazon charges Grocery & Gourmet products priced over $15 a 15% referral fee. Sell on Amazon Per-unit calculation Line item Arithmetic Amount Selling price $24.99 Referral fee $24.99 × 15% -$3.75 Base FBA fulfillment fee Large standard, 8+–12 oz -$4.20 Fuel/logistics surcharge $4.20 × 3.5% -$0.15 Total fulfillment fee $4.20 + $0.147 -$4.35 Monthly storage See calculation below -$0.03 Net proceeds before inventory cost $24.99 − $3.75 − $4.35 − $0.03 $16.86 Product cost -$11.00 Preliminary profit $16.86 − $11.00 $5.86 Monthly storage estimate Amazon’s current standard-size storage rate is approximately $0.78 per cubic foot from January through September and $2.40 per cubic foot from October through December. Amazon Seller Central Using a placeholder package size of 6 × 4 × 3 inches: Package volume: 6 × 4 × 3 = 72 cubic inches Cubic feet: 72 ÷ 1,728 = 0.04167 cubic feet September storage: 0.04167 × $0.78 = $0.0325 Rounded monthly storage = $0.03 per unit October–December storage: 0.04167 × $2.40 = $0.10 per unit For all 200 units: September storage: 200 × $0.0325 = $6.50 per month October–December storage: 200 × $0.10 = $20.00 per month Storage is not the problem here. Fulfillment classification, price movement, expiration, and sell-through are the problems. 200-unit position Inventory purchase: 200 × $11.00 = $2,200 Estimated proceeds before COGS: 200 × $16.862 = $3,372.40 Estimated preliminary profit: 200 × $5.862 = $1,172.40 That $1,172.40 is not true landed profit. It excludes: Inbound shipping Inbound placement charges Labeling or polybagging Prep labor Damaged or unsellable units Returns Advertising, coupons, or promotions Storage beyond the first month Aged-inventory or storage-utilization charges Small-standard sensitivity Should the exact ASIN’s Fee Preview confirm small standard and no more than 8 oz, the fulfillment fee would be approximately $3.66 after the surcharge, improving profit by about $0.68 per unit. Do not count that improvement until Seller Central confirms it. 2. ROI, margin, and price floors Based only on the fees modeled above Profit per unit: $5.862 ROI: $5.862 ÷ $11.00 = 53.3% Net margin: $5.862 ÷ $24.99 = 23.5% Break-even sale price Let P equal the sale price: P − 15% referral fee − $4.347 fulfillment − $0.0325 storage − $11 cost = $0 0.85P = $15.3795 P = $18.09 Bare mathematical break-even price: $18.10 That is not a safe operational break-even because inbound and prep costs are still missing. Minimum price for 30% ROI A 30% ROI on an $11 cost requires: Required profit: $11 × 30% = $3.30 0.85P − $4.347 − $0.0325 − $11 = $3.30 0.85P = $18.6795 P = $21.98 Bare 30% ROI Buy Box floor: $21.98 More realistic operational floor Because inbound freight, placement, prep, and returns are unknown, I would hold back at least $0.75 per unit as a temporary reserve. Adjusted profit at $24.99: $5.862 − $0.75 = $5.112 Adjusted ROI: $5.112 ÷ $11 = 46.5% Adjusted margin: $5.112 ÷ $24.99 = 20.5% Adjusted 30% ROI price floor: ($11 + $3.30 + $4.347 + $0.0325 + $0.75) ÷ 0.85 = $22.86 Current realistic 30% ROI floor: approximately $22.86 Q4 stress test Amazon’s 2026 holiday peak fulfillment period runs from October 15, 2026 through January 14, 2027. Amazon says the peak increase averages approximately $0.32 per unit, with the 3.5% fuel surcharge applied on top. Amazon Seller Central +1 Using that average rather than pretending we know this ASIN’s exact peak rate: Estimated peak fulfillment: ($4.20 + $0.32) × 1.035 = $4.68 Q4 storage: Approximately $0.10 per unit Q4 30% ROI floor with $0.75 reserve: ($11 + $3.30 + $4.68 + $0.10 + $0.75) ÷ 0.85 = $23.33 At the current $24.99 Buy Box: Price cushion: $24.99 − $23.33 = $1.66 Percentage cushion: $1.66 ÷ $24.99 = 6.7% A routine 6.7% price decline kills your 30% ROI target. That is the central weakness of the deal. 3. Velocity reality check Questions that must be answered before placing the order Question Why it matters What is the exact ASIN, UPC, flavor, and pack count? A wrong variation or pack-count match makes all calculations worthless. What are the 90-, 180-, and 365-day Buy Box averages? Today’s $24.99 price may be a temporary spike. What is the effective customer price after coupons and Subscribe & Save? The displayed Buy Box may overstate the price you will actually compete against. How many FBA sellers are active now versus 30, 90, and 180 days ago? A rising seller count predicts compression. Does Amazon Retail, the manufacturer, or a dominant authorized seller appear regularly? They can take most of the Buy Box and price aggressively. How many units does the listing actually sell monthly? BSR alone does not tell you whether your 200 units will move. What is your realistic Buy Box share? Listing sales do not equal your sales. How much inventory do competing sellers hold? One seller sitting on 500–1,000 units can control the listing for months. Is demand materially stronger in May–August? Electrolytes can have summer-sensitive demand, and this purchase is occurring near the end of summer. What percentage of recent reviews mention expiration, clumping, broken sticks, flavor changes, or damaged boxes? Those complaints predict returns and stranded inventory. Sell-through requirement For 200 units, I would require a credible path to sell them within 60 days, not merely “eventually.” Required personal velocity: 200 units ÷ 2 months = 100 units per month A basic conservative estimate is: Expected monthly units = Listing monthly sales × your estimated Buy Box share Example: Listing sales: 800 units per month Competitive FBA sellers: 10 Naive equal share: about 10% Expected personal sales: about 80 per month Time to clear 200: approximately 2.5 months That would already be marginal because equal sharing is optimistic. Established sellers with deeper stock, better account metrics, or lower prices may receive more Buy Box time. Answers that kill the deal I would walk away at $11 if any of these are true: The 90-day median Buy Box is below approximately $23.33. The price repeatedly touches $21.99 or lower. The current $24.99 price is more than roughly 10% above its normal 90- or 180-day level. There are eight or more competitive FBA sellers and the count is rising. Amazon Retail or the brand owner regularly controls the Buy Box. Conservative expected sales for your offer are below 100 units per month. A competing seller has several hundred units at or below the Buy Box. The seller count has increased by 50% or more over the past one to two months. Multiple sellers are repricing within pennies of each other. Most sales occurred during summer and velocity drops sharply in September through February. The listing has suppressed Buy Box periods, frequent stockouts, or repeated listing closures. The effective customer price after coupons is already below your ROI floor. 4. Risk flags Risk Rating Assessment Brand gating and approval High / unresolved Approval is account- and ASIN-specific. Amazon says branded groceries may require brand authorization, and the exact product should be checked through Catalog → Add Products → Apply to Sell. Sell on Amazon IP complaint exposure High / unresolved “Name-brand” without the brand is not enough to assess complaint history. A wholesaler invoice helps, but it does not guarantee the supplier is in an authorized distribution chain or that Amazon will accept the documentation. Being ungated does not mean the brand cannot file a complaint. Meltable or temperature-sensitive Low physical risk A sealed dry powder is generally much safer than liquids, gummies, chocolate, or glass. Verify that it is ordinary shelf-stable powder and not a product Amazon classifies as temperature-sensitive. Seasonality Medium to high Hydration demand may be strongest during hot weather. A September spot price could reflect the tail end of summer demand rather than the listing’s year-round economics. Oversize fee trap Low oversize risk; high fee-tier risk The box is unlikely to be bulky or oversize, but it may be large standard rather than small standard. Packaged dimensions and Amazon’s Fee Preview must settle this. Fragility and returns Low breakage; medium condition risk The product is not glass, but crushed cartons, torn sachets, clumping, leaking powder, flavor complaints, and wrong-count complaints can create returns or customer-experience issues. Expiration High Amazon requires expiration-dated inventory to have enough remaining life for full consumption plus an additional 90 days. Amazon Seller Central Price war High until proven otherwise A $1.66 Q4 price decline removes your 30% ROI cushion. That is a very small buffer on a branded consumable with potentially many FBA sellers. Expiration standard I would impose For a 30-count product taken at one serving per day, Amazon’s general consumption-plus-90-days framework implies roughly 120 days minimum at fulfillment-center check-in. That is only a policy-style minimum, not a safe purchasing standard. For this 200-unit buy, my requirement would be: At least 12 months remaining when received Preferably 15–18 months One consistent lot, or a lot-by-lot quantity breakdown Clearly readable dates on every retail unit No stickers covering the original lot or date information Written confirmation of the exact date before payment I would reject mixed lots or inventory with less than 12 months remaining unless proven velocity is exceptional. 5. Final verdict NEGOTIATE Single strongest reason At $11 cost, a normal 6.7% Buy Box decline during Q4 takes the deal below 30% ROI after only a modest operating-cost reserve. The headline 53% ROI is misleading because it assumes: The current Buy Box holds The item clears quickly No meaningful inbound or placement expense No price war No approval or IP issue No expiration problem The assumed fee tier is correct Target unit cost: $8.75 I would set: Target: $8.75 Absolute ceiling: $9.00 Order condition: Exact ASIN passes approval, seller-count, price-history, and expiration checks At an $8.75 cost, the deal would still produce about 31% ROI at a $19.99 selling price under the Q4 stress assumptions used above. That is the kind of downside protection I would want before taking 200 units. Supplier script I can take all 200 units immediately at $8.75 each, provided they are one confirmed lot with at least 12 months remaining and you can issue a complete Amazon-acceptable commercial invoice. Next step Before issuing the PO, verify the exact ASIN/UPC, brand, expiration date, packaged dimensions and weight from Amazon’s Fee Preview, 90/180/365-day Buy Box history, estimated monthly sales, current FBA seller count, and Amazon’s presence on the listing. Until those checks pass, this is a negotiation opportunity, not an approved buy.