FineArtAmerica.com It costs nothing to create an account and costs about $30 year for their Print On Demand function which allows people to purchase your originals and also prints. What ever your profit goes directly into your paypal account.
It's a really neat site with lots of support--computer/techy support, as well as other artist support. And they make quality, giclee prints. I've been selling my art on their site for a couple of years now. And am happy with them.
As with hubpages, don't expect to make lots of money fast, it takes time.
Let me warn you though, DO NOT get sucked into any of the sites (like art-exchange.com) that require large amounts of up-front money. Or want to take your art to an art show in New York or Dallas or where ever, and charge hundreds of dollars!