One tip for researching the fair market value of a car is to use online resources such as Kelley Blue Book or Edmunds to get an idea of the average price range for the make and model you are interested in. You can also check out local classified ads and dealership websites to see what similar cars are being sold for in your area. Another option is to consult with a trusted mechanic or car expert to get their opinion on what a fair price would be based on the car's condition and mileage.