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if you own textbooks that you don't use anymore you can sell them online.

buy a bunch of candybars and sell them on the street for twice the price. Tell them it's for you school fundraiser.

buy games from one store and sell them to a different franchise. Gamestop will take returns without a receipt for store credit, so if you can buy a sealed game at one store for 50 and sell it to a place like gamestop for 60 etc...