Did you pay with a credit card? If you did, charge it back and send it back to the seller using USPS w/delivery confirmation. Send it back in packed the cheapest way possible don't worry about packing it properly so that it does not get damaged in shipping, your credit card will only care that the item was returned and that you can prove it. You will not get the money back for the return shipping but you will get a full refund on the price you paid including the shipping cost to send it to you.

First rule of buying on ebay is to always pay with a credit card because they will defend you a hell of a lot better than ebay or paypal. Your credit card will put the money back into your account immediately and paypal has to deal with the seller, let them wait for the seller to refund the money to them.