Artfire

I enjoy selling on ArtFire, because it's a friendly place, the seller tools are great, it aims at the whole internet of shoppers not just at people shopping that site, and there is a lot of conversation between the administrators of the site and the sellers (and buyers). They have a monthly fee (currently about $10) but no fees to list, and they don't take a percentage of your sale price. They also encourage links into and out of the site, for instance to a blog or website.

Become an ArtFire Pro with this link and get your 3rd month free!