I'm beginning to think that it's more on the western side of the Rockies. I know it's available most everywhere in my neck of the woods. The large bottles of course are at Costco. Smaller ones available at most larger supermarkets, see above quote. I know that Fred Meyers is associated (owned?, I dunno, there's Kroger products on the shelves) Krogers. You might give them a look.
SWMBO and I are very close to retirement and I can see now that we would not move to any area that does not offer Yoshida's. Yes, it's that good. I don't think I'd even attempt stir fry without a dash of Yoshida's.