Retail and online arbitrage explained: the rules on Amazon and Walmart, whether it's worth it in 2026, and how to start.
Updated October 27, 2026 · By the Margenos team
Retail arbitrage is buying products at a discount in physical stores, often on clearance or sale, and reselling them online for more than you paid after fees. Online arbitrage is the same idea, except you buy from retail websites instead of store shelves. Both are legal in the U.S. when you sell genuine, new products, but each marketplace has its own rules about what you can sell and how you fulfill orders. This guide explains what retail arbitrage is, whether it's worth it in 2026, how to start, and which apps help.
Arbitrage means profiting from a price difference between two markets. In reselling, the two markets are a store and an online marketplace like Walmart.com, Amazon or eBay. A toy on clearance for $10 in a store might sell for $25 online. If the spread is bigger than the marketplace fees, shipping and your time, you make money.
Retail arbitrage is how many sellers start, because you can begin with a few hundred dollars, a phone and a seller account. You buy items one or a few at a time, so you're not stuck with a case of something that doesn't sell.
Online arbitrage (OA) uses the same math, but you shop retail websites for markdowns, coupon stacks and cashback deals, and have the items shipped to you or a prep center. It's easier to scale because you don't drive store to store, but popular online deals attract more resellers, so margins can disappear faster.
| Retail arbitrage | Online arbitrage | |
|---|---|---|
| Where you buy | Physical stores | Retail websites |
| How you check deals | Scan barcodes with a phone app | Browser extensions and sourcing software |
| Best for | Deep in-store clearance, local finds | Scale without driving |
| Main cost | Your time in stores | Software and more competition |
Yes. In the U.S., the "first sale" principle generally lets you resell a genuine product you bought lawfully without the brand's permission. The risks come from the details, not the idea:
This is general information, not legal advice.
Yes, Amazon allows sellers to resell items bought at retail, but many brands and categories are restricted. Getting approved for them often requires invoices from a manufacturer or distributor, and store receipts frequently aren't enough. Amazon's drop shipping policy also prohibits buying from another online retailer and having that retailer ship straight to your customer when you aren't shown as the seller.
Yes, with rules. Walmart's shipping and fulfillment policy says you may not buy products from another retailer and have that retailer ship the order directly to the customer, a practice the policy itself calls retail arbitrage. So you buy the item, receive it, and then ship it yourself or send it to Walmart Fulfillment Services. Items must be new unless Walmart has invited you to its Resold program, and some categories, such as beauty and personal care, now require extra documentation. See Walmart reselling rules for details.
It still works for sellers who check every item before they buy. What has changed is that more brands are restricted, more resellers use the same apps, and marketplaces ask for more documentation. The sellers who do well treat it like a numbers business:
Many sellers use retail arbitrage to learn and fund their account, then add wholesale for steady, repeatable stock.
The best retail arbitrage app is the one built for the marketplace you sell on:
Free retail arbitrage apps usually limit scans or data. Our roundup of the best reseller apps compares them in more detail.
| Walmart Marketplace | Amazon | |
|---|---|---|
| Getting in | Application-only; business tax ID required | Open sign-up; individuals allowed |
| Monthly fee | None | Professional plan has a monthly fee |
| Referral fee | 15% in most categories | Varies by category |
| Competition | Fewer sellers per listing | More sellers per listing |
| Fulfillment program | Walmart Fulfillment Services (WFS) | Fulfillment by Amazon (FBA) |
Walmart is harder to get into, but once you're approved there are often fewer sellers on each listing. If you sell on Walmart, read the Walmart arbitrage guide and how to resell Walmart clearance.
Sources: Walmart shipping and fulfillment policy · Walmart resold products policy · Walmart seller registration guide · Walmart referral fees · Walmart.com Terms of Use · Amazon drop shipping policy reminder · Traverse Legal on retail arbitrage. Walmart changes its rules; confirm in Seller Center.
Retail arbitrage is buying discounted products in physical stores and reselling them online, on marketplaces like Walmart, Amazon or eBay, for a profit after fees.
Online arbitrage is buying discounted products from retail websites and reselling them on a marketplace for more. It uses the same profit math as retail arbitrage, without visiting stores.
Yes. In the U.S., you can generally resell genuine products you bought lawfully. Problems come from selling items that differ from the brand's version, restricted brands, and marketplace or store rules. This isn't legal advice.
Yes, but many brands and categories are restricted, and approval often requires invoices from a manufacturer or distributor. Amazon also prohibits having another online retailer ship directly to your customer when you aren't shown as the seller.
Yes, for sellers who check profit after fees, sales speed and competition before buying. It's more competitive than it used to be and more brands are restricted, so many sellers combine it with wholesale.
The Amazon Seller app is free for registered Amazon sellers, and some apps have free tiers with scan limits. Margenos, built for Walmart Marketplace, has a 14-day free trial.
Yes, if you're an approved seller and the items are new and not restricted. Walmart doesn't allow you to buy from another retailer and have it ship straight to your customer, so you receive the items first, then ship them or send them to WFS.
Scan in store with the Android app or check any Walmart.com listing in Chrome. Margenos shows fees, profit, ROI, sales estimates and competing sellers. Start your 14-day free trial.
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