I want to say you can get international money orders at the post office or perhaps it was more like a cashiers check from the bank. Check with both. It's been a real, real long time since I had to send any paper payment, but when I started on ebay I had a lot of overseas purchases and would use one of the above. And I only ever used the USPS MO or a cashiers check so it had to def be one of them.
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USPS
http://www.usps.com/money/sendingmoney/sendmoneyinternationally.htm