How to deal with multi national traffic? and another Q

Hi,

I have a blog that I review products for in a specific niche, the problem is my traffic is soley driven through SEO and mainly comes from the UK and USA.

The problem is, the affiliate links I display currently are to amazon uk and another large uk based e-commerce retailer.

What would be the best way to serve up country specific affiliate links in a wordpress post?

Which leads me to my next question, how would I go about displaying the current price of a product from a merchants site? Most of them have a data feed available and some dont, but I cant for the life of me work out how to use the datafeed within wordpress

Thanks for your time

this looks like the daddy - http://blog.datafeedstudio.com/integrating-datafeed-studio-with-wordpress

but how could you then geo target?