Such a shelf or area exists in most supermarkets here in :france-cool:

Usually there's an asiatic food one, a mexican one, an italian one, a smaller UK one, and an even smaller US one. The US one usually contains root beer and a few brands of peanut butter (almost universally Skippy, at least here), with little else.

This tends to exist even in smaller reachable-by-foot local supermarkets.