Do you like browsing through used books? We'll be having a book sale here in the library, on the ground floor. It will be April 23-24, look for the signs advertising it as the date draws closer!
A great online site to browse for used books, including textbooks, is AbeBooks, which lists the holdings of over 13,000 booksellers, so there's something for everyone. Are there other sites that you like? Post here and let us know about them.