C.P.
I'd check with www.chegg.com (just type in the isbn number and they will let you know if they are willing to buy it and for how much). If you use code CC104388, they will actually give you an additional $5.00 back for every book they buy back.
They also rent books (way cheaper than buying them) and you can use that same code for an additional 5% off your total.
For every book they rent or buy, they will also plant a tree, so it's a win-win situation.