19. Sign up for supermarket reward cards
Supermarket prices often are cheaper for people who sign up for reward cards. These cards increase customer loyalty and help supermarkets track what people are buying. Rewards programs typically are free. The cards easily can be swiped at checkout, just like credit cards. There may be added benefits, such as gasoline discounts. Just be sure that having a card doesn’t lead you to buy more food than you planned to get added rewards.