It doesn’t count obviously if it’s a misplaced item and the price is clearly labelled for another item. However, if a store leaves discount stickers on some product late, or mislabels some price, they are obligated to sell at that price. There is caveat that it only works if the price is believable, but I managed to get a ton of shrimp that just arrived at a Lidl 90% off one time. Family was eating shrimp for weeks.