Where is he? It's almost always possible to dig up an address somewhere. If it's even close to reasonable driving distance, just go there. I had to drive to Nebraska once after I bought an amp and some subs that mysteriously never got to me. The description and everything had pictures of their shop and after hours of digging I finally found an address. Got there, it was the guy's house. He had no shop, just pictures he'd taken from a warehouse in downtown Omaha. I got the money back with intrest and a bullshit explaination, which I didn't care to hear. (I live in Missouri. It was like a 6 hour drive.)
USE PAYPAL... I just disputed a claim for an overpriced wireless pinhole security camera from taiwan that dood decided he'd just never ship. And out of 8 emails, he replied to one with a 1 liner. Got the $ back, no problems.