Dollar-stores overcharge customers while promising low prices

"When buying groceries—food and non-alcoholic beverages, pet food or supplies, disposable paper or plastic products, soap, household cleaners, laundry products, or light bulbs—you must be charged the lowest displayed price, whether on the sticker, scanner, website, or app.

If the lowest price you saw for an item is $10 or less, and that lowest price is not what you were charged or not what appeared on the in-aisle price scanner, the first item should be FREE. If the lowest price you saw for an item is more than $10, and that lowest price is not what you were charged or not what appeared on the in-aisle price scanner, you should receive $10.00 off the first item."

https://www.mass.gov/info-details/consumer-pricing-accuracy-...

Not to say it's not happening in a Mass based Dollar Stores but you could be walking away with a lot of free stuff and it would be enough of a deterrent to stomp out the practice. I've had it happen at grocery stores usually at their suggesting.

1. Buy the items and sue.

2. Take the items without paying, likely get the police called on you, and defend yourself in criminal and civil court.

Edit: Yeah, I did say before the purchase, but I should have said after the purchase when they pay the legally correct price but the store accuses them of shoplifting and tries to detain them. And I know it's often infeasibly hard to pay the legally correct price from a logistical perspective without the cashier's cooperator, especially if you want to pay with a card. It is clearly possible to put at least the right amount of cash on the counter, ask for the change, and attempt to leave if they refuse, but that doesn't guarantee ever getting the change. Anyway, I did list this option as (purely) theoretical and not as actually practical.