Just try getting your money back anyways lad, there is a few people on ebay at the moment who are breaking sri 150s as i have been asking about an air compressor to most of them, if not all of them. lol
I got shafted for £98, when someone didnt send me the goods, and then become a none registered user, i dont know about the postal order and getting the money back, but paypal got me the money back within 3 days of me making the claim, really easy to do too.