I know they put the stickers on there so the checkers will know what to charge, but I don't know why, because I am often charged more than the shelf price that has not been put on the computers/scanners yet. A manager at Wal-Mart told me that has been a problem for them, but they are working on it, trying to get the price changes on the scanners faster. That said, I hate the stickers they put on fruit and vegetables too!