Where I live, even if you are fully vaccinated, you are required to wear a mask in Winco. The announce every 15 minutes over the store PA that is required to do so for everyone over 3 years old. We have a tremendous amount of immigrants in that store. On the other hand, Costco has no requirement to wear a mask. You are on the honor system if not vaccinated.
Up here in CT not a single chain retail sites enforces masks anymore. Some have a big sign out front along with pre-recorder PA messages encouraging people to wear one “for everyone’s safety” but the second the mandate was lifted at least half stopped and by now maybe 1% still wears a mask.
Most other stores just removed all the signage or have a tiny letter size or smaller sign in the window.