You should complete comparables whether you are trying to sell your vehicle on your own or trying to figure out if the vehicle you are looking at is a good deal. Many publications are available in book form or on the Internet. Some examples include Kelley Blue Book, NADA, and Edmunds. You can also look at other individuals selling a vehicle similar to yours. However, you do need to be reasonable. Just because your neighbor sold her car for $1,000 more than you are asking does not mean your car is worth that much. The actual value is dependent upon several factors such as paint quality, interior condition, or mileage on the vehicle.