Online Arbitrage on Amazon: Product Selection, ROI and Risks

Online arbitrage means buying a product from another online store and selling it on Amazon for more. Buying off a store shelf is retail arbitrage; buying online is online arbitrage. Neither involves a brand of your own: you join an existing Amazon listing as one more seller. You can start with little capital, but the model loses money when the math is incomplete. This guide covers how to pick products, how to work out ROI and the most you can pay, and which rules can put your account at risk.

Is online arbitrage allowed on Amazon?

Amazon’s own guide to reselling (September 2025) describes buying products cheaply from retail stores and reselling them on Amazon as a business model. The same guide stresses three conditions: follow Amazon’s selling guidelines, get approval where a category requires it, and be ready for extra documents such as invoices for products bought from retailers. It also tells resellers to keep the purchase records that prove where a product came from and to read Amazon’s intellectual property and anti-counterfeiting policies. In short, the model is allowed; not every product is open to every seller.

Online arbitrage, step by step

1. Find candidates. Compare discounts, promotions and clearances in online stores with the prices on Amazon.
2. Run the numbers. Take the referral fee, the FBA fee, the buy price and the freight to the warehouse off Amazon’s sale price and work out ROI.
3. Check you may sell it. Can you list it in new condition, or does the brand or category need approval?
4. Buy it and keep the invoice. The invoice should clearly show the seller, the date, the product and the quantity.
5. Prep it and send it to FBA. The goods come to you or a prep center, get labelled and go to an Amazon warehouse.
6. Track sales and real profit. The gap between the profit you expected and the profit you made is the most useful input for your next buy.

The number that decides: ROI

“It sells for $25 on Amazon and I found it for $10” is not a deal yet. The referral fee, the FBA fee, freight to the warehouse and a returns allowance all come out of that gap. The arbitrage seller’s main measure is ROI: net profit ÷ the money you put into one unit (the buy price plus freight to the warehouse). The example uses a made-up product from VeraMargin’s demo store: a 750 ml stainless steel water bottle in Home and Kitchen. The sale price and FBA fee are the demo store’s; the buy price and freight are assumptions for this example.

Buy the same bottle at $8 and ROI rises to %83.4; buy it at $12 and it falls to %26.5. Two dollars on the buy price halves the return. In arbitrage, the profit is made when you buy, not when you sell.

The selling price moves just as much. While your stock is on its way, other sellers join the listing; if the price slips to $21.99, the same buy makes $2.87 and ROI drops to %26.3. Amazon’s reselling guide warns about the same thing, a “race to the bottom” on price, and suggests setting a minimum price that protects your margin.

The most you can pay

It is more useful to work backwards: “what is the most I can pay for this?” With a %30 ROI target, the net profit at buy price B (24.99 − 3.75 − 4.75 − 0.17 − 0.90 − B) must be at least 0.30 × (B + 0.90). That gives a maximum of $11.65. Buy at that price and you make $3.77 at %30 ROI; anything dearer misses the target.

Then there is the break-even price: below what Amazon price does the bottle you bought for $10 lose money? In this example, $18.61. If competitors are pricing close to that, buy fewer or don’t buy.

VeraMargin’s Product analysis works out both numbers for every product: the break-even price and the most you can pay per unit to reach your target, which is your minimum ROI filter if you set one.

What is a good ROI?

There is no official threshold, from Amazon or anyone else; the threshold is your safety margin. Weigh three things when you set yours:

• Returns. When a sale is refunded, Amazon gives the referral fee back minus a refund administration fee (%20 of the referral fee or $5, whichever is less). If the unit comes back unsellable, you lose the buy price too. For the bottle above, assuming the FBA fee doesn’t come back either, one unsellable return costs 4.75 + 0.17 + 0.75 + 10.90 = $16.57: more than three sales’ profit.
• Price drops. A $3 drop halved the ROI in the example. More competitors make it more likely.
• How fast the money turns. A %30 ROI product that sells 30 a month can earn more than a %60 ROI product that sells 3, because the same cash makes more rounds in a year.

Set a minimum net profit per unit next to the ROI. %40 ROI on one dollar of profit looks fine on paper, but a single return or a small price move wipes it out. That is why Product analysis has separate minimums for ROI and for profit.

What to look at when choosing a product

• Sales velocity. Best Sellers Rank (BSR) is the product’s sales rank in its category: the lower the number, the more it sells. But BSR is not a unit count and means different things in different categories; look at its trend over a few months, not today’s value.
• Competition and the Buy Box. Check how many FBA sellers are on the listing and the lowest FBA price. If Amazon itself sells the product, sharing the Buy Box gets harder.
• Price history. If today’s price is a short spike, it may be back down by the time your stock reaches the warehouse.
• Size and weight. The FBA fee rises with the size tier, and profit melts fast on big, heavy items. Storage is charged by volume too.
• Dangerous goods (hazmat). Aerosols, batteries and some cosmetics can carry extra rules. When no source says, VeraMargin shows “Unknown”, never “No”; if you are unsure, check in Seller Central.
• Package quantity. If the Amazon listing is a 3-pack, your cost is the cost of 3 items. Comparing a single item’s price with a multipack listing makes a losing product look like a deal on paper.

Are you allowed to sell it? Restricted categories and brands

Amazon requires approval to sell in some categories and for some brands. Its reselling guide names collectible coins, entertainment and sports collectibles and fine art as examples, and there are brand-level restrictions too. Buy something you are not approved for and the stock stays with you. So check before you buy: when you try to list a restricted product in Seller Central, it shows the way to apply for approval.

If your Amazon store is connected to VeraMargin, Product analysis asks Amazon this question for every product, with your own store, and shows the answer beside it: “No listing restriction”, “Approval needed” or “Restricted”. The answer covers new condition only and does not include FBA eligibility or dangerous goods, so “no listing restriction” does not mean “sellable”. You can filter the list to hide products that need approval.

Invoices and authenticity

If a brand or Amazon questions whether a product is genuine, your purchase records are your only defence. Amazon’s guide tells you to keep them and says invoices may be required for products bought from retailers. Two habits help: buy from sellers who can give you an invoice in your name and business address that clearly shows the product and quantity, and file invoices so you can find them by product.

Four ways to lose money

1. Price war: other sellers saw the same discount you did; within days the price is below break-even.
2. Stock that doesn’t sell: it pays monthly storage, and after 181 days the aged inventory surcharge starts too.
3. Units counted short: Amazon can count fewer units than you sent. You can file a claim in Seller Central, but only within a set period.
4. Account health: an intellectual property complaint or an authenticity claim can put the whole account at risk, not one product. Stay away from doubtful brands and keep your invoices.

Online arbitrage with VeraMargin

• On the product page: the Chrome extension shows ROI and net profit per unit on product pages in Amazon US, UK, Canada, Australia and the UAE, and works it out again when you type your cost. The compact card also shows the FBA fee, the referral fee, the lowest FBA price with its number of FBA sellers, and whether Amazon sells. Save a product with its cost to your list.
• Bulk checks: in Product analysis, paste up to 50 ASINs at a time or upload a CSV/TXT, with minimum ROI and profit filters, the break-even price, the most you can pay, and CSV export. You enter cost per sellable unit, or as the supplier’s single-item or case price if you prefer. Enter it that way while the listing’s package quantity is unknown and VeraMargin doesn’t assume 1; it asks you.
• Unknown is never zero: if Amazon gives no FBA fee for a product, profit, ROI and margin are not shown, rather than worked out with a fee of zero.
• Credits: each product analysis uses one research credit, and the same product again within 24 hours is free. The free plan includes 30 analyses a month once a store is connected, and 5 credits in all before that. A sales estimate costs one more credit, only when you ask for it.

See how the extension works on the Amazon FBA profit calculator page and install it from the extension page. How many credits each package includes is on the pricing page.

Starter checklist

1. Open your seller account and see which categories and brands are restricted for you.
2. Set a minimum ROI and a minimum profit per unit, and write both down.
3. Run every candidate with all its costs: buy price, freight, referral fee, FBA fee, surcharge and a returns allowance.
4. Before buying, check your approval, the BSR trend, the number of competitors and the price history.
5. Know the most you can pay before you buy; pass on anything above it.
6. Start small: a few products, a few units of each.
7. File invoices by product.
8. Once sales start, track the profit you actually made. How each fee really works is in the 2026 referral and FBA fees guide, and the difference between margin and ROI in the profit margin guide.

Sources

Last checked: 25 October 2026.

• Amazon: Guide to reselling in Amazon stores (17 September 2025)
• Amazon: referral fees by category (US)
• Amazon: FBA fee types · fuel and logistics-related surcharge