What is the most expensive car in the world? The 1931 Bugatti Royale Kellner Coupe was sold for $8,700,000 in 1987. However, that car and many alike will not be included in this list because it is not available on the market today . However, if you have the money and the opportunity, you will definitely spend a small fraction of it to place a few of these supercars in your garage. Here are the 10 most expensive production cars on the market.