contact ebay, show them proof you paid, and tell them he never sent your package... should get your money back i think? if not go through paypal, tell them you bought something off ebay and the guy isn't sending what you ordered... and ask them if they can transfer the funds back...

if you do end up fucked in the end, let this be a lesson to only use people who have really good ebay reputation (i forgot what it's called lol but there's something to show how well of a reputation they got going.)