Online and Retail Arbitrage on Amazon: How It Works

Arbitrage means buying products below their usual price and reselling them on Amazon for more. Retail arbitrage is buying in physical stores, often on clearance; online arbitrage is buying from other websites. It's a common way to start selling on Amazon, but Amazon's rules on where your inventory comes from shape what you can safely sell. This guide explains how arbitrage works, the rules that matter, and the costs to count.

How arbitrage works#

The basic loop:

1. Find a product selling on Amazon for more than you can buy it for elsewhere.
2. Check the numbers: its price history, how fast it sells, and what's left after Amazon's fees.
3. Check that you can sell it. Some brands and categories need Amazon's approval.
4. Buy, list and ship, either to Amazon's warehouses (FBA) or to customers yourself (FBM).

Sourcing tools speed up the first two steps. Our guide to Amazon seller tools covers scanners, Keepa and profit calculators.

Restricted brands and "ungating"#

Some categories, brands and individual products are restricted: you need Amazon's approval before you can list them. Getting that approval is called ungating.

Amazon says approval generally needs an invoice from a manufacturer or distributor (or a letter from the brand), dated within the last 180 days and covering at least 10 units. Sellers quoting Amazon's approval messages say retail receipts and online order confirmations aren't accepted. In practice, that means arbitrage sellers often can't get approved in restricted brands at all, because store receipts are all they have.

Avoid any service that sells invoices to get you ungated. Some tools legitimately check your eligibility and open Amazon's own request page; that's a different thing.

Proving where your inventory came from#

The bigger risk for arbitrage sellers comes after listing. Amazon can ask you to prove your supply chain, either after a customer or brand complains that an item isn't authentic, or on its own. Amazon staff have said these reviews can happen without any complaint, and that retail receipts and order confirmations wouldn't meet its responsible sourcing requirements.

If you can't provide documents Amazon accepts, it can remove listings and restrict or suspend your account. Amazon takes counterfeiting seriously: it says it seized and destroyed more than 15 million counterfeit products worldwide in 2025.

This doesn't mean arbitrage is banned. It means:

• Keep every receipt and order confirmation, organized by product, even though they may not be enough on their own.
• Be careful with brands known for authenticity complaints, and with brands that sell on Amazon themselves. These are the riskiest to resell, and they're also often the hardest to get approved for.
• Never buy from questionable sources, such as unknown sellers, auctions or liquidation lots. Amazon's wholesale guide says auctions and liquidation aren't valid sources, and that retail-to-retail drop-shipping is prohibited.
• Sell only new items in the condition you list them, with original packaging.

Transparency codes#

Some brands enroll products in Amazon's Transparency program, which gives every unit its own code. Units without a valid code can be blocked from shipping. If a product page shows it's Transparency-enabled, a unit bought at retail may not have a code you can use, so check before you buy.

Retailers' limits#

The stores you buy from have rules too. Target's and Walmart's terms let them limit quantities and refuse sales to resellers. Clearance deals can also be one-offs, so arbitrage income tends to be uneven.

The costs to count#

Before you buy, count everything:

1. What you pay, including sales tax.
2. Amazon's referral fee, 15% in most categories with a $0.30 minimum.
3. Fulfillment: FBA fees and storage, or your own postage and packaging. Our guide to FBA vs FBM covers both.
4. Shipping inventory to Amazon and any prep, such as labeling.
5. Returns, which come back to you, sometimes damaged.
6. Your time: driving between stores or scanning websites adds up.
7. Tax on your profit. Our guide to reseller taxes explains what to report.

An item that only works out at its best-ever price, or only if it sells this week, is a risky buy.

Common beginner mistakes#

• Buying before checking you can sell it, then finding the brand is restricted.
• Ignoring slow sales. A good margin on an item that sells once a year ties up money and runs up storage fees.
• Relying on one listing's price without checking its history in Keepa.
• Paying for "done-for-you" programs that promise passive income. The FTC has sued sellers of AI-powered Amazon store schemes; our guide to Amazon seller tools covers what to avoid, and our guide to buying on Whop explains how to check a seller.

Many products need approval before you can list them; our guide to Amazon ungating explains how it works.

Arbitrage tools on OOSClub#

The Amazon FBA & FBM niche lists sourcing scanners, research tools, repricers and analytics tools, with what each does, its prices and refund terms. Retail resellers can also find cook groups and monitors on the retail reselling niche.