If you're using a site based on WordPress, you can use
the Amazon Localizer plugin and it will automatically
direct the visitor to the right Amazon site based on
their location:

WordPress › Amazon Affiliate Link Localizer « WordPress Plugins (no affil.)

You still need to sign-up at the Amazon sites to get your
separate affiliate IDs. Just insert them into the plugin and
it'll redirect the visitor to the appropriate site.

Dedicated to mutual success,

Shaun

Thanks a bunch man. Much appreciated.

How would this work without wordpress?

Shaun, as this is going to result in a nice cookie, how do you configure for the new cookie law? It's a bit confusing what needs to be done, so I'd like to hear what you've done with this.

are they not legal cookies?

or am i wrong lol.

Yeah, there's no definition anywhere, as far as I can find, and no real show of what to do unless you pay someone to do something that'll probably not work anyway...

Could anyone clarify this problem??

I am using a free plugin that gives a cookie message, requires no action if they aren't bothered by cookies.

For amazon i create 2 links for every product us and uk, takes time but works.