As an online buyer or seller of used books, what kind of features you want on an e-commerce website?

Question

Examples:
Buyer: I could reserve used books that will be available in the future.
Seller: I could receive notification on the status of book I sell.

Answer 1

Really I would choose a site because the prices were reasonable and for availability. College books are incredibly expensive. I would buy from a particular site because they 1. have the books that I need and 2. are affordable.