I know that I have to sign up to amazon UK, Canada etc. to monetize traffic from those regions. That's no problem. My problem is If someone comes from the UK, how can I get wordpress to put up an amazon UK link instead of an amazon US link? I've heard of EasyAzon but it sn't ideal for me because I just want to test if I'll actually get any sales using amazon UK and amazon Canada. I've literally only got about 20 links I want to test so don't need EasyAzon.