You’ve avoided the possibility as long as you can, but after one more day of hearing your car’s engine wheeze and rumble you realize it’s time to trade in what you have and get a new, or at least more recent, ride. If you find it’s not in the budget to get a new model, buying a like-new pre-owned car will see you through traffic at a decent gas mileage and pace, though you may find it a challenge to get what you want at a price you can afford. It is helpful to know how to negotiate with car dealers.