Dollar General

This item was sitting in $5.00 slot but when rang up was $8.50. This happens to me alot. Very aggravated. Is this new thing of getting customers to buy? No happy at all. Why must a customer have to pay for the mistake? The item wasn't like throwed in there, it was sitting upright to the front. I would understand if the item was deliberately throwed in that place but it was there neatly.