Another options... Etsy:
http://www.etsy.com/search/handmade/plants_and_edibles/baked_goods/cake?q=cakes&view_type=gallery&ship_to=US

You don't have to worry about traffic or maintaining the web site and their fees are 20 cents per listing for 3 months. If you do sell there is an additional fee. They allow paypal, credit cards, gift cards, etc.