Since you probably have less than 10 hrs of sewing on it I would ask the same price as you paid. But you also might ask at the local repair shop if you can trade in for something else.
It sounds like you are not familiar with buying or selling online. Be careful as there are alot of scammers (to start with, say "cash only"!). You might want to enlist a friend or family member who has done this to help you manage the process.