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There’s a new way to make money from old textbooks. Use Amazon’s new trade-in program
First you find your book or DVD on the trade-in site, which I linked to above. When I searched for “chemistry” the program found 1,295 results with trade-in values from $.90 to $77. You can also search by ISBN number.
If Amazon accepts your book in their trade-in program (make sure the ISBN number matches exactly), print out a shipping label, which Amazon pays for. When Amazon receives the book, it verifies it matches what you said it was, then the company drops an Amazon.com gift card into your account. Voila! Cash for next semester’s books.
Related:
Tips to save on college textbooks
Welcome to Bargain Babe! I’m Mara, and I’m so glad you’re here. I am an obsessive bargain hunter and penny pincher, and I am determined to live a full life without EVER paying full price. 
Try Chegg.com You can actually rent books for a semester and return them for your money. There are deadlines, but if your school schedule doesn’t match the deadline for returning the book, you can add time to your rental for an extra fee. Most deadlines are accurate though! Also, if you have purchased books, you can sell them to Chegg and recieve a check in the mail, or credit toward renting with Chegg. I haven’t checked which is a better deal when it comes to getting money back, but every student knows what a headache buying/selling books is, and the “blockbuster” way seems less of one!
Great tip, I’ve already mailed it to my college student. thanks