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Hi Jeff,
Netbilling does this for you already. But if you're not with netbilling you can do this on your own. Sure he can use proxies but Netbilling also blocks known proxies from buying if you enable it.
If you can write basic code you can write a small program to filter out IP addresses you don't want, or write a program to display all of your sales along with the IP addreses. Link the IP addresses to a GeoIP location service (there are lots of free ones) and when you see the geo location fall within the range you want to block, delete his account and refund the purchase before it becomes a chargeback.
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