TERRIBLE COMPANY. I sent in 2 textbooks plus their $5 coupon in January. Finally after emailing them a few times to check on the status of the order near the end of February, they responded back "Your order was received, but the box was empty. The box was damaged in transit and the Post Office lost the items." I highly doubt that the post office would deliver a ripped empty box. They then claimed that they will still send me a $5 check.
Now a month later, I still have not received my $5 check, even though the website says it has been paid. I called up customer service, and after being sent to voicemail 4 times, finally got through. I told her how ridiculous it was that THEY lost my books (and not the post office), and she said it happens ALL THE TIME. She said that my money was sent, but she would check with accounting and then promptly hung up on me.
SCAM! DO NOT USE! They pull you in with their high buyback prices, but then steal your books.