Chegg is an excellent site for students looking to buy or rent text books. Also, students can find ebooks as well as sell their books. Another great feature of Chegg is their educational portal which helps students w/ their homework. This is done by either typing a question or by browsing through Chegg books w/ step by step instructions/solutions.
I highly recommend checking out Chegg if you're looking to buy/sell textbooks (ebooks), homework help or math answers.
*Chegg is a paid advertiser of Technology Tidbits.