I would think your best bet would be to put up a flyer at the school you took those courses at - since those taking that course will need the same books YKWIM?
And get rid of them quick! We still have a book full of textbooks from when hubby got his degree 14 years ago! He doesn't want to part ith them because he had to pay so much for them - but by now - they are out of date.
Kim