Paperbackswap.com
I love this site. You sign up and list any books that you want to trade. You receive credits for the first 9 books you list. Then you can use the credits to get books from other members. I have filled out my collection of certain authors and read books by some authors that I would normally not read, mostly because I wouldn't waste the money on an untried author. The only cost is the stamps to mail out the books to other members. Most of the time it is only $1.59.
When you mail books to other members, you get credits when they receive the book.
This might not be for everyone, but I love it. I have save almost $300.00 since October.
