You can also try cash4books.net. I sold some of my old textbooks couple months ago and got about $160 for it. You enter the ISBN number, and they will tell you if they will take them and how much they will pay for it. Then, you box it up and take it either to the post office or Fedex with a prepaid label to ship it to them. If you choose to get paid via paypal, they will give you an extra 3%...that's what I did, and I got my $$ in my paypal account within couple days after they received my shipment.