Reply #3: I always read the receipt on my way out the door.

[politicat]

It's habit, partially formed at costco, where you have to have your receipt in hand to get out the door.

King soopers is my overcharge bugabear, here. About once a week, the manager and I go look at a posted sign, s/he takes the sign down and gives me my money back.

I've gotten free snickers candy (at Halloween), a free iron (rang up 7.99 when posted 5.99), meat...

I think it's store policy to give the item for free or to give the proper price.