[QuantumNomad_]

In Norway, if you notice that the price at checkout is higher than what it said on the shelf, you can in most cases demand to pay the shelf price and the store has to honour it unless it is an obvious error such as some expensive electronics being tagged as costing an impossibly low amount.

It goes without saying however, that the customer himself is of course not allowed to alter the price on the shelf (like the Flipper Zero program in the featured link facilitates) and then pay the altered amount :P

[BizarroLand]

In America you can also do that, but how far you'll get is highly reliant on the mentality of the manager that has to do a price override.

For the most part, when it's happened to me, they've always taken the loss on the chin and then the next time I come in the prices have been updated, but I have also once encountered a grouchy old bastard manager who, when I asked to pay the price that was listed on the shelf, immediately launched into a tirade about how people are so ungrateful and how he's not making any money, blah blah blah.

I immediately put my intended purchases on the counter and left while he berated me the entire time I was walking out of the store.

But, crazy people aside, if you're not a dick about it then most of the time they'll do right by you.