Raen: I would ask the question: What are your terms, conditions and policies for buy back or returns of books purchased? I would expect their answer to contain the following information: restocking fees (non refundable part of your purchase, usually on a per-item basis) shipping charges percent of money returned based on the condition of the returned item (like new, good, acceptable, etc), and description of the criteria for assigning the attribute time limits on returns (since new editions are published continuously, the old editions become practically worthless) correspondence or permissions required before return, timeliness of money returned etc.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.