I don't normally post links but I am a member of this book trading site and really like it. The problem is it is new and the selection is low but you can't get a good selection without some active book traders so if you are interested take a look and consider joining. They are giving up to 20 free trade points during the testing period. That could add up to 20 free books. I am looking forward to trading with you. http://www.tradeatitle.com