I don't recommend selling to them. The shipping label they send is for Media Mail, which is notoriously unreliable. They quoted me an unbelievably high payout, so I picked them over other options. Well, Media Mail made it all the way to Huntsville AL, which is where Textbook Maniac is located and then... stopped updating tracking. I'm pretty sure the package was delivered without being scanned, but Textbook Maniac told me they never got it. I emailed them several times and got contradictory responses.
We do offer an upgraded shipping method to include insurance. Media mail is free, however. If the book would have arrived, it would have been in our inventory. It was not, so we couldn't have received it.