Used Books for a Cause and Chocolate to Boot!
Better World Books serves a dual purpose--saving books from adding to our landfills and increasing world literacy rates. In addition, according to Books Inq. (I haven't been able to find it one the main site yet), they are offering a free-trade chocolate bar for free with every order of three or more books. Ah--notice came in an e-mail and the offer starts at the beginning of November.