You can do your bit by bringing all the items to the checkout, ask the price of them all, swap half of the “too expensive” ones. Then repeat. Until finally you have purchased what you want while driving them crazy.
Chain convenience stores and grocery stores will reliably list their prices for each item
No, but the self checkout machine will, as long as the item has a UPC code.
Wouldn't raising awareness of the illegal activity be the easier thing to do?
[0]: https://law.justia.com/codes/new-york/2006/new-york-city-adm...