Graphic FBML has just evolved. Payvment E-Commerce Storefront is the answer for all those who would like to sell products right from their Facebook page. Its a free app that can be instlled directly for those who can code but for those who cant appbistro is the place to go. Payvment is free and uses PayPals API for the transactional process. The app can also be used for normal web-stores .
Connect to them directly on Facebook