You will need your receipt to return any books. In order to return any books, they must be in the same condition as when purchased. During the last week of every semester a representative from an independent book wholesaler visits the campus to buy used textbooks. You could receive up to half of the purchase price, depending on the bookstore needs, and whether or not there is a new edition. This representative often buys books for his warehouse as well, so bring if you have a textbook you'd like to sell, bring it in and have him take a look.
Many students wait until the first week of classes to buy their books.
This is the busiest time, and during this time you will usually find very long lines. This makes for less congestion in the Bookstore. If you're lost, don't hesitate to ask for help.