Write a list of college textbooks that you want to sell. Make certain to write down the complete title and edition for each book. Copy the ISBN number for each book as well. Keep this list in a safe place.
Take your textbooks to the bookstore at your college during its textbook buyback days. Most colleges set aside a couple days at the end of each semester to buy back used textbooks that they can resell the next semester. If the college will no longer be using a textbook you own, they are not likely to buy back the book.
Post an advertisement on campus for textbooks you want to sell. If your school offers public bulletin boards, print a list of books you want to sell as well as the price. Do not forget to add contact information. Post your ad as permitted across campus. If students need those books for future classes, you can make some sales.
Offer to sell college books directly to anyone you know who will be needing those books next semester. You might learn that a friend or younger sibling will need a book for a course he will be taking during the next term. Offer to sell him your used book at a fair price. You will save him money on his textbook fees while also earning money for yourself.
List your used textbooks on eBay and other online auction websites. Most auction sites require you to enter the ISBN number. Refer to your list. Websites such as eBay will often show you a price range for products that are the same as or similar to the one you are selling. Use that information to help price your books.
Sell your textbooks on one of the textbook buyback websites. These sites allow you to enter the ISBN numbers for any books you want to sell. The website will then generate a list of the books it is purchasing and the amount they will pay you for those books. After shipping the books to the buyback company, you will receive a check for the textbooks you sold.