look up your car online in the blue book. They will look at your vin number and tell you what your car is worth. If it is in excellant condition, then use the high price or if in poor you can use the lower price they give you. Also, think about if you need to replace your car with another ride. Never tell anyone what is the lowest price you will accept. They have you by the short hairs at that point. But you will get more money by selling privately.