The supermarket I visit most has these too and I just ignore them. I just look out for the sale stickers on the shelves for stuff I want. About one out of 10 of those scan at the regular price so I've gone to taking a picture of the sticker for anything I buy on sale. After checking out I go to customer service to point that out and they refund the price and let me keep the item. I can save $5-$10 on an average visit.