This very rarely happens in MA, because when it does the store has to give you the item for $10 off, including if that makes it free. And they have to post a sign at the register explaining the law, which means when you're invoking it all you need to do is point at the sign.
https://www.mass.gov/info-details/consumer-pricing-accuracy-...
The confusion around this law is quite frustrating, though. Quite a few customers think they're entitled to not just prices on tags that haven't been updated, but prices for what are clearly entirely different products.
If not, there’s an obvious loophole here. Misprice intentionally, then stop purchasing the item from your distributor if you get called on it, rotating in some similar thing. Later, bring it back with a different sku, or mispriced at some other level.
This would work well for dollar stores, which are optimized to spread in / sustain food/retail deserts.
The store is often literally the only option in town. The wouldn’t even need to sell excess warehouse inventory at the advertised price, since they could just shift supply to another state (or county/store, depending on how poorly the law is worded).
https://mda.maryland.gov/Documents/HANDBOOK%20130%20Examinat...
Practically-speaking, stores have at least as long as it takes for an inspector to come out to the physical location. So, yes, it's a bit of a loophole, but I imagine that if you're mispricing as a matter of course and getting hit with complaints and constant inspections, you're probably going to eventually get fined (unless you're paying off inspectors). Store operations are usually designed to catch mistakes, as half the job is making sure items are stocked and labeled correctly. (I think most stores would prefer to transition to essentially local warehouses that delivered to customers from online orders, so that they wouldn't have to deal with any of this, but then they'd lose out on impulse purchases.)