When you sign up for paperbackswap.com and list 10 books, you'll get 2 credits!
1 credit = 1 book!
So 2 free books!
Don't know how paperbackswap.com works?
Basically everyone on the site lists books they don't want anymore, you search, find a book you want, and request it if you have the credits to do so!
That user then sends you the book and they get your credit!
Very nice system, where no real money changes hands, and to get a book you can either pay for credits, or you can list your own books you don't want anymore and receive credits that way!
If you do sign up, it would be great if you listed my email sweetimpishpixie (AT) gmail (DOT) com as the person who referred you!