Local grocery stores (Albertsons/Safeway, Kroger/Fred Meyer, probably others) do something like this nearly every week. Meat items (chicken, pork chops, beef etc) that are (for example) 3.99/lb get put on bogo sale at 6.99 or 7.99/lb. Probably other products as well, but I just notice it at the meat counter. Gotta wonder whether they really think people are that dumb...or if people actually are that dumb...or if it's an astonishingly effective way to make a profit off the people that don't want 2 of something.