I've discovered something called the Paperback Swap. Someone e-mailed me about it after having stumbled upon the "Stump the Bookseller" post on my blog many months ago. (I have a weird feeling you told me about it once, too, Patsy... but I had totally forgotten about it until now!)
What happens is, you put a list of paperbacks up on the site that you're willing to send away, and you can also request books from other members. You get the books sent to you for free. The only thing you pay is the cheap Media Mail postage on whatever books you send out.
I think it's a great idea. I've already requested a couple of books and I'm mailing one out to someone tomorrow.
Whoo hoo! I love the Internet!