This one is always at the top of the search rankings:
http://www.quiltsforsale.ca/
Their commission seems reasonable enough, and they handle customers through Canada and the United States. I've noticed that quilts do seem to sell frequently there. Prices are all over the place, as some quilts are tied and some are custom quilted. What's nice is that you can search by size, color, or price. I've considered trying it myself, but just haven't gotten a "round tuit". :lol: