Really blocking international buyers

From poster thebuybox2011

To block payments go to paypal.

Click profile, on the next page ,on the left side of the screen, click "my selling tools"

Under the "Getting paid and managing my risks" section click on The "update" link across from "block payments".

Answer yes for "Block payments sent to me in a currency I do not hold" and check the box next to "Block payments from users who: Have non-U.S. PayPal accounts"

Then scroll down and click save.