2 days ago · Believe it or not, Kelley Blue Book has been providing used car values for almost a century. Shop Smart, Step by Step Let Kelley Help You Shop Like a Pro 1 Start with Your Current Car Get an estimated value or a fixed offer to buy your car. Kelley Blue Book used-car trade-in value is the amount a consumer could expect to receive from the dealer if she or he traded it in as part of a transaction for the purchase or lease of another vehicle. 1950s American 1960s American German British Italian Exotics Hagerty Valuation Tools. Car Values. Good thing Kelley Blue Book has over 90 years of experience with used car pricing and weve done the analysis for you. Build more value into your automotive software products using vehicle values that consumers trust and the automotive marketplace relies on.