I'm not sure what data Hagerty uses, but the current values they show seem about right ($236k average). Your timing is good. Some will need to sell their previous gen GT to purchase the new car. Start a thread that you are a ready, cash buyer, describe exactly what you want and state your price range. As long as you are reasonable with your price range, you should get responses. You'll be surprised how many people would sell simply because you're making it a painless transaction.
After looking and waiting over two years to buy a used street configuration Kirkam Cobra, I changed strategies and did exactly the above on a Cobra forum. With less than a dozen or so of those cars produced up to that point in time, I was contacted by someone who had thought about selling for a long time, but did not want to deal with tire kickers. I asked him to send me a video and detailed pictures of the car. Afterwards, I flew to Oregon and drove the car. I bought it on the spot.
Don't hesitate when you find the car you want, even if it's a little more than you want to pay. Best of luck to you in your search. The car is definitely worth the effort.