I have found thru years of watching ebay for a good bargin that quilts rarely sell for much more than the costs of making them if even that. Unfortunately that has been the case with handmade items for years. There is a site called Etsy you an use. I'm not sure what the costs is. I know several friends have tried Craigslist.com as you can post for free. Only one has ever sold one that way though.
Good luck on the sale. Hope it sells quickly and helps out.