What is online arbitrage?

Buying discounted products from retail websites to resell on Amazon.

Online arbitrage (OA) is buying products from retail websites - Walmart, Target, Kohl's and hundreds of others - at prices below what the same product sells for on Amazon, and reselling the difference. No store trips, no imports, no private label: the product already exists and already sells; you supply it cheaper.

The work is in the finding: comparing thousands of retail prices against Amazon, fees included, faster than the deals disappear. That comparison is what sourcing software automates - scanning entire store catalogs and returning only the products where the numbers work.