A low price and the possibility of bargaining:
this is the list of main benefits. This is the main advantage of buying a used car. If the car is a year or two old, it will cost 20-30% less than a new car.
Haggle if you buy a used car. Car owners overcharge cars to haggle with a buyer when they meet.
The car owner will not lower the price for no reason. To find any flaws, take your car to an auto shop for diagnosis. Worn shock absorbers (for example) are a serious reason to haggle.