I have seen 1 or 2 scattered over the course of time.
I used to know of one fellow that would help out my wife with ours before I met her, but haven't heard from him in a while. I think he passed it to his son. There is Brett with Savannah Auto Air, I think he also owns a TTA. There is another fellow in Beaufort, just over the river, I typed to back a few months ago that has a Ttype and a converted GTA (if memory serves).
Myself, I live just up the road in Statesboro. I believe we are the only TR/GN owners in our county. There was another young fellow that had a rough looking 86, but it got sold just down the street a short time ago. Have no idea where it went, but it probably got parted out.
PM/email me some time and we can go show the boys in the Savannah car club some Buick Power! They have many a late model TransAm and a few rustangs and really wanted to see our GN (didn't have it with me that day). Ran into them at a local car show sponsored by Southern Cruisers.