It cost $800 USD for an entire day of driving. It was expensive, but I couldn't think of another time when I would have the opportunity, so I jumped at it. The company is called World Class Driving and they are touring the US offering days like these. They said they are in the process of getting an Aston V8 Vantage and the Porsche 997 Turbo. I think they also have a 612 and an F430 Spider that see more time on the West Coast. Their website is
www.wcdriving.com if you want to see if they will be arriving anywhere near you. I highly recommend it!