If you paid by credit card, you can dispute the charge because you did not receive the product and he did not communicate with you. If he is selling on Ebay, is his website an Ebay store? If so, Ebay's safe harbor program might be able to help. Lastly, there is an internet better business bureau
http://www.bbbonline.org/where you can file a complaint and get assistance, or you can go to the secretary of state for the state he runs his business from and they can help you resolve this. Good luck to you!