On Etsy, there is a lot you can do to market your shop and they have their own community of shop owners with forums and a lot of info on how to improve sales. The Admin also has newsletters, full of info on how to maximize sales. The fees are very reasonable (there's a calculator here
http://www.rolbe.com/etsy.htm so you can figure what your profit will be).
You can also look at Artfire (
http://www.artfire.com/ ) and Big Cartel (
http://bigcartel.com/ ). Others are 1000 Markets and Artful Home. Etsy is the best by far and their community gives them a serious advantage over the others. My 2¢