Mainly in neighborhoods with a large Jewish population in larger metropolitan areas. In Cleveland, KFP Coke is imported from the bottler in Chicago, not the local Coke bottler, and it’s only available in the inner-ring eastern suburbs. KFP Coke is usually sold at a higher price than regular Coke, and at regular supermarkers it’s usually placed in a special display in a different part of the store to avoid confusion. The bottlecap or can top will have some Hebrew lettering on it. KFP cans will look like generic Coke cans, with no promos like buy-one-get-one-free amusement park admissions or anything like that.
I’ve seen other KFP soft drinks, but Coke seems to have the most mystique about it. I’ve even seen KFP Diet Coke, which makes me think “what’s the point?”