I've never had the opportunity to fly in one, but they are available in many places on the used aircraft market.
You would be amazed at the ex-military aircraft in private hands. A4 Skyhawk jets are out there now, but the wildest I've ever seen was a F104 Starfighter that a guy brought to Sun-N-Fun in Florida about ten years ago!
Ahhhh, if I only had the $$$$$...