That's one of the single best things about Wal-Mart, they don't f* around with prices, "Everyday low price" is both a motto and a method (https://en.wikipedia.org/wiki/Everyday_low_price), which also helps them keep their prices low, since they aren't engaging in all sorts of frictions in marking prices up and down, advertising sales, etc. etc. Probably also helps keep their logistics sane, they only have to deal with the normal ebbs and flows of demand, not artificial demand created by sales, or lack of demand created by people waiting for the next sale.