I love great sites and stores that sell books that have a cause attached. If you know of any others, please share! My favorite is

www.betterworldbooks.com

"Better World Books collects and sells books online to fund literacy initiatives worldwide. With more than 8 million new and used titles in stock, we’re a self-sustaining, triple-bottom-line company that creates social, economic and environmental value for all our stakeholders."

I love this.  I'm going to have to start buying and selling on this site.  Thanks for posting. 

LOVE these guys! I actually purchase lots of books from them, through Amazon.com, for school and for pleasure. Shipping is always prompt & the books are usually in even better shape than listed to boot!! :)

I just bought Zoo Keepers Wife, Memoirs of a Geisha, and another book (that i seriously cannot remember right now) for $10, with free shipping from the site. They have a bargain bin, which after 3 books is $3 more per book. I bought them last night, and got ship confirmation today. They are awesome. When there was a post office error with one of my textbooks for this semester, they refunded me the price and shipping! They are seriously great. :)

I just bought The Zookeeper's Wife and two other books for $10! It was such agreat deal and I feel so good about this purchase, too.