The fact that people don't put stuff back or demand the price difference be dealt with at the counter, says a lot about how observant people really are. I worked at gas stations for years, and this was a common mistake. Usually employees are understaffed and overworked and don't always catch up to updating price tags when the prices have changed. Every organization of this magnitude has corruption somewhere, and this is not new to anyone who has worked in retail. My local DG is pretty consistent with prices. Shop somewhere else if you don't like the way a store operates. Power of the purse, y'all