translation multilanguage country

What's the best options(s) to structure our multi-country site. The site probably wants to be managed off one installation, but it will be (in terms of thinking about it) country-based not language-based so for example:

www.example.com/ca/fr/widget/price would be in French with the price in CAN dollars
www.example.com/fr/fr/widget/price would be in French with the price in Euros
www.example.com/us/en/widget/price would be in English with the price in US dollars
www.example.com/gb/en/widget/price would be in English with the price in pounds etc