Art Fire is an international online Artisan Marketplace. You can set up an online shop. They offer Basic (free) and Pro ($15.95/mo) memberships. This is a great way to get your work to a larger audience without the expense of traveling to out-of-state shows. Not limited to handmade items. They also sell vintage/antique items and various art supplies.
Etsy is an international online art gallery. You can set up an online shop for free. It costs $0.20 to list an item for four months. When the item sells you’ll pay a 3.5% transaction fee. Only handmade items are for sale. Some unique art supplies are also available for purchase too. There is a lot of online help within the site and you don’t have to be very computer savvy to set up a shop. You can also link to your website and set up to receive credit card payments via PayPal without having separate credit card services.