Production of the XJ220 lasted from 1992 until 1994. They were based on the 1988 concept car designed by Tom Walkinshaw Racing. The engine used in the concept was a V12, and the goal of the production team was for the car to reach 220 mph, hench the name.
The production version of this car used a V6. This was done for several reasons. The V12 engine proved to be too big for a car with such a light body. Engineers were having trouble taming this car with such a big engine, and just wedging the massive engine in proved to be a problem. Another problem was emission standards. The V6 engine was cleaner, allowing the car to be sold in all markets.
The final production vehicle was made rear wheel drive instead of all wheel drive like the concept car. The final twin turbocharged V6 made nearly 550 horsepower, propelling the vehicle down the road at record speeds for a production vehicle.
Though the original sticker price of $650,000 seems high, these cars did not last, and that price would be a steal today. Some original customers included the Sultan of Brunei, who is famous for his car collection, and Sir Elton John. The Sultan ended up having a XJ220 modified by Pininfarina.
These cars are not going to show up on your local Jaguar dealer's lot. You have next to no chance of finding one for sale. Believe it or not, your best bet is eBay, where a listing might pop up about once a year. If you're in the market for one of these cars, you probably already have the money to pay for it. I suggest you bribe a Jaguar executive for a list of original buyers. Just kidding, maybe.