<p>You can buy books anywhere and still sell them at the on campus bookstore. There’s also Bookholders and Tech Bookstore off campus, neither of them are affiliated with the university. They sometimes give more cashback than the bookstore and it doesn’t matter if you bought the book from their store or online. One semseter I got a back off of ebay, and then made about $20 profit when I sold it to Bookholders.</p>