I like to pay in cash and get handed a receipt on the spot. Because, frankly, what I buy at the supermarket is nobody's business but my own. If a store has a

I like to pay in cash and get handed a receipt on the spot. Because, frankly, what I buy at the supermarket is nobody's business but my own. If a store has a "reward card," (i.e. they have an extra markup which you can remove by selling them your personal information), I shop somewhere else.