All use a very effective device to persuade you to come to the store and buy. The words may vary, but merchants and advertisers know that sales attract customers.
Smart shoppers know how to see through sales promotions to find the best item at the best price.
Right away, you'd know the sale price is no bargain. You buy gas there all the time. You know what it usually costs. To find out, compare prices at a number of stores. If time permits, do this over several weeks.