Question about ebay and international buyers

I need a little help guys. I listed an item on ebay and I only ship to the United States. However, a buyer from Australia won the item. Now I am willing to complete the transaction but don't want to get burned. I only accept paypal from the US naturally since I normally only ship to the US. What payment and shipping method would be best if I decide to complete the transaction?
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It costs just under $30, and meets PayPal's "seller protection" terms
(It includes $100 INS, and an online viewable signature-receipt.)
usps.com