Duplicate Content within different TLD

Hey Seoexperts!

I was asking me the following situation:

You have a business and you want to have a website in the USA, Canada and UK. For every country you have a different TLD (.us, .ca and .co.uk).

The text and products are the same for every country, you just have some different Prices and Contact informations. Maybe too some special products and special actions for every country.

So what about the duplicate content problem? 80% or more of the text of these websites would be the same.

What is the best that you can do in this case? Is it better to register maybe a .com domain and make some subdomains for every country? (uk.domain.com) or some folders? (domain.com/uk/)

Greetings