One strategy for finding a reliable used car is to purchase a lightly used one from an established rental company. They turn over their inventory often, so many of the cars they sell have fewer than 20,000 miles on them and still qualify for a new car warranty. You can buy these nearly new cars for about one-third off the new car price. Enterprise Car Sales lists its nationwide late-model-certified used cars online. Just type in your ZIP code to see cars available within about a 100-mile radius.