I’ve just finished adding Amazon.com’s Textbook Trade-in prices to the site. The service is pretty new, and I’ve not heard much feedback about it yet. Beware that they offer payment ONLY through Amazon.com gift cards. My understanding is that they pay credit directly to your account, so I don’t know if there is any way to sell the gift card and convert it to cash. I believe that the buyback program is actually run by a third-party and not by Amazon directly.
From what I have seen, the service has been offering pretty competitive prices on some books recently. I’ve actually seen cases where they were buying books back for more than double the lowest marketplace price, so I think that they are still figuring out how to calculate their prices. I think they have some of the obvious problems worked out, but hopefully their new buyback program will be a good avenue to make some more money for those used books.
With the addition of Amazon, that brings the total number of vendors searchable on BookScouter to 40, making it the most comprehensive site of its kind.