C.O.
ask your friends on Facebook or Twitter.
Try Craigslist - it's free. Meet the person in a public place and accept CASH ONLY.
You can contact the venue and find out if they do refunds...there are a few that do. You might not get all the money back - it doesn't hurt to ask!
last option - would be ebay. That would be the place that will cost you to sell...your listing might be free - but you'd have to pay final value fees...
Good luck!