Pay off your credit card
Average savings: $65

On average, consumers who carry a balance owe $2,200, on which they pay 15.2 percent in annual interest charges. Eliminate that and save $28 per month. Some 15 percent of consumers carry balances of $10,000 or more, according to Fair Isaac, the credit-scoring company; they can save at least $125 per month by paying off their debt.

How to do it. Paying off your balance is easier said than done. The trick is to stop charging. Then pay more than the minimum required each month until it's paid off. Dig up cash for this from your U.S. Treasury stimulus check, garage sales, or extra work part-time.