It begins with a lovely early-morning shot of the old Mayfair store; location unknown. Believe me. I tried. There are message boards devoted to these things, with locations here and there, but it would take an hour or two of clicking on Google Street View in search of something that's probably gone.
And what a pity that would be. Look at that place. The windows, the circular cut-outs in the awning: a grocery store for the Future, Today!