If you can sell them locally, go for it.
I always prefer to sell things I don't need anymore to folks that will use them instead just giving them away. Often it seems like giving someone a thing makes it seem like "junk" and they appreciate it less. Have them pay a few dollars for it and it becomes a prize they will use with pride.
I have 2 kids in college (another one done and one who's still in HS) and appreciate any help in buying a text book or two that we can get.