M.F.
I've sold some old text books to Amazon in the past. You put in the ISBN number for the book, they tell you how much if any they will give you in credit, then you print out a pre-paid shipping label, box them up and bye-bye. Super easy, totally worth not having to drive around and haul them into a used book store and I considered it free money since they were sitting in a box in my garage for many years. I used another website also, can't remember the name, but they took a few things that Amazon didn't or offered a better price. The books I couldn't sell, went into the donation bag