One of the coolest sites ever
Paperbackswap.com gets you free books!
From the website:
What is PaperBackSwap? We are a group of real people who have formed a Club to swap paperback books with each other. No gimmicks. No spam. No advertising. No kidding. We are not a large corporation trying to sell you something. We're just a group of real folks who wanted a way of trading paperbacks with each other through the U.S. mail. Please read the testimonials and you will understand that this book club is for real.
When another member requests one of your books, you mail it to them. Yes, you pay for the postage. But then another member returns the favor when you request a book from them and they mail it to you. And that way the books are always free because we are all trading books with club members!
Once you have registered, simply list your paperback books that you would like to share with other Club Members. Once you have listed at least 9 of your books, we will give you 3 book credits to get you started trading books with other club members. However, the more books you post, the more likely you are to receive requests. And that means more books for you. So post as many books as you can!
I've received a bunch of great books from them already including:
E.M. Forster, Aspects of the Novel
Betsy Lerner, The Forest for the Trees: An Editor's Advice to Writers
Dai Sijie, Balzac and the Little Chinese Seamstress