Make Simple Online Dollars by selling your Art at Deviantart

Deviantart is a place for artists to share their work, build portfolios, receive feedback from fellow artists, and its also a cool place to sell your work on different kinds of products, or you can now sell your art directly for whatever price you wish. The cool part about deviantart is that there are no fees, you get to keep all your money! I am sure there would be a small fee if you choose to withdraw through paypal tho.
This is Deviantart's description about their site:

As a community destination, deviantart is a platform that allows emerging and established artists to exhibit, promote and share their works within a peer community dedicated to the arts. The site's vibrant social network environment receives over 160,000 daily uploads of original artworks ranging from traditional media such as painting, sculpture, to digital art, pixel art, films and anime.

Check out deviantart