Someone put this link on another board I'm on. Its so cool! You can swap books for just the postage it takes to mail them to someone.
Textbooks (homeschoolers are you paying attention???), paperbacks, hardcover, audio etc etc. I've already mailed a book off and I just joined it yesterday. A great way to purge your library and get "new" (to you) books.
If you want to put me down as a referral use this email: