I don't know if my last question posted but, any ideas how to sell a prom dress never worn before?

if my last question didn't post, my date left me the day before prom and since he doesn't go to my school i payed for both his and my expenses for the prom which includes tickets, party bus, after prom tickets, seaside (boardwalk in jersey where school goes to after) dress, jewelry all by myself. I couldn't find another date in time so i ended up not going to prom, im trying every way to get my money back starting w/ my prom dress never worn before, still has tags and everything. I bought it for a little over $400 dollars and it looks like this http://ep.yimg.com/ca/I/yhst-16947620440049_2157_61721169 . Any websites i can sell this on ?!