Booligan.com is mainly a free website for college students to trade their textbooks with other students from their campus. Got a book you're finished with? ADVERTISE IT! Chances are, there's a handful of students who need that very book next semester and who knows? They might be finished with something that you need.
With this service, college students won't have to keep buying overpriced books from campus bookstores - we all know what a rip-off that can be. So simply post what you have and what you're looking for. And don't fret - this website is not limited to books. Booligan will try to facilitate all categories and eventually you will be able to barter, buy, or sell pretty much whatever you want amongst students from your campus or nearby ones.