Oh wait, hold on......
I vaguely remember being in a few stores that have salad bars and bowls of olives at other sort of stands...is this what you mean by "olive bar"
when I've been into these supermarkets (hardly ever actually) I am so in awe at all the displays can't really remember them in detail....was in the States last at a supermarket about 3 years ago....business trips don't allow time for food shopping.