You will hear two terms when you look at buying and selling items on Amazon FBA. One of those is Online Arbitrage or OA for short.
Let me try to distill the meaning of OA to the bare minimum.
Online arbitrage is buying products from one online retailer and selling them elsewhere. The goal is to make a profit on the difference between the purchase and sales prices after subtracting all costs.

A significant advantage of OA is that you can do it from anywhere with a computer and internet connection. You don’t need to receive the items you purchase before forwarding them to an online marketplace like Amazon FBA for resale.
There is no shortage of opportunities to make online arbitrage as complicated and expensive as making a profit becomes complicated.
However, on PennyStupid.com we try to make side hustles success easier than stumbling along by yourself.
One of the software platforms I’ve tested for OA is Source Mogul. There are others. But there is assistance out there to help locate products that meet your purchase criteria for sale to make money.