Your profit margin with retail arbitrage will differ depending on how much you pay for the items you sell on Amazon and how much customers are willing to pay for them.  Many retail arbitrage sellers use 10 to 30% as a strict benchmark. To help ensure your success as a beginner, it’s a good idea to use the exact figure as a rule of thumb. Only source retail arbitrage products that you can get for 10 to 30% lower than their minimum cost.