One shop that provides faux food for the Japanese restaurant industry is Ganso Sampuru (Sample). They have a retail outlet in Kappabashi in Tokyo, which I have visited on several occasions.
The most amazing thing is that you will not see spray painted fried chicken anywhere. Rather, they make molds from real food where possible and sell reproductions in resin or vinyl.
Where this has some interest to us modelers is the paint application. I have no idea how they do it, but they nail it! I marveled at the seafood, wondering how they got the tiny chromatophores on the squid and the complex coloration on the fish, shrimp, crabs and lobsters. I was tempted by the king crab, but it was too big and quite pricey!
Don’t like seafood? They also sell beverages in glasses, like beer with foam on top, fancy colorful drinks with whipped cream and a cherry on top, and regular soft drinks.
I think the store is mostly for us dumb tourists, since they customize each dish for their business clients. A friend bought ala carte components (pork cutlet, rice, shredded cabbage, and pickled ginger) to make a meal. Final cost? $80!