Book Trader is packed with used books, CDs, collector's magazines, and even a few new books. The owner is very familiar with her stock and can often recommend authors or series once she knows your tastes. You can cash in gently used books for store credit, but you can only use store credit for a percentage of your next purchase. Store credits are logged into a personal account for you, so you won't need to keep slips of paper or anything to redeem them. Book Trader is a great place for finding inexpensive or out of print used books.