Any Wordpress Amazon site-builders have built in GEO-IP?

Hey you all.

Checking out site-builders like WP Zon builder to build masses of Amazon sites. What disturbs me is that I am not finding any similar products with GEO-IP tracking built in. It would be excellent if one could make sites where the affiliate links get changed to amazon.com, amazon.co.uk, amazon.de , amazon.fr , depending on the IP of the surfers. Does something like this exist already?