Book Buy Backs As a service to students, Skyline College Bookstore buys back textbooks and select supplies during finals week of each semester. Books are purchased for both the bookstore and a wholesale used book company at up to 50% of the purchase price. In order for the bookstore to pay 50% for a title, the bookstore must have an inventory need for it and a book request from the faculty for the upcoming semester before the beginning of book buy backs. Certain restrictions apply. Please contact the textbook department for further details. Click Here for Book Buy Back hours, date and location.