Book Buy Back

So I'm kind of peeved.  MCC's book buyback program and BookMark's buyback program are really ripping students off.  I bought a used textbook for a business intro class for $100.  For those of you that read me frequently, I love business and this class is really very unnecessary.  I know the material covered by this class inside and out.  Anyway, I tried to sell the book back to the school, but I learned that they will not be buying the book back because they have moved on to the next edition.  I then went to the independent book store across the street from the school called BookMark.  They also would not buy the book back.  I guess that I'm going to have to sell it online.