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 video because it is not available on the market today. It is hard to imagine someone would actually spend 8 million dollars on a car instead of using it for something more productive. 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 is the 10 most expensive cars available on the market.