I can't cite details, but I believe that case law has settled this many times.. When a customer enters a commercial business, there are implied contracts that are enforceable.. I am thinking of restaurants first. I believe it is the responsibility of the goods and services provider to show prices accurately and honor them, and variations of that are well-understood in court. These kind of transactions are common for thousands of years in the West.
>They went up to $1.25 in '21 I think. It was extensively cover by the press.
I'd love to see a citation on that, since I think you're mistaken -- there's plenty of things that are still a dollar, mostly stuff like packages of napkins or plastic cups, cards and other sundries.
(What was extensively covered was that they were no longer a "everything is a dollar" store.)