I did a P51 flight at Stallion 51 in Kissimmee, FL a couple years ago. At the time it was USD 2100.00 for 30mins and USD 3000.00 for an hour.
Yes expensive, but a fantastic one-off treat. I did an hour flight of aerobatic moves away at a training area. Great experience and they have internal/external video cams for nice take away video. Highly recommend it.