http://www.carfax.com/car_buying/used_car_buying_guide.cfm - If you're buying a car soon and it's used, make sure you're not getting a lemon. It can be very stressful to buy used cars, mainly because you don't know what to expect. Only buy cars when you're 100% confident in your purchase. Look for companies that offer car price guide info and vehicle history reports so you have the entire picture before you buy.