A couple months ago I got a 2004 Boxster S with alot of options through Carmax (I did not believe it either) with 21K on the odometer. It was 23,999 on the internet and 30,999 when I got to see the car with the sticker. Carmax gave me the car at the lower price and I bought an extended warranty for 2000. I am good to 95,000 miles. I would suggest checking them out. One of the others in our Porsche club did the same thing.
Tony