Rick,
Check out autotrader.com and look up TD's. They list 30-40 of them, and I see one around here every 6 months.
I adore my W116. It is by far, the most pleasant car I have ever owned.
I would be interested in a '79 TD, but I don't think they have a turbo. I never see them for sale or on the road either.
What I really want is a 67-71 280 SL, but I am dreaming. That V.W. is a cool wagon.
I heard cat's attack the driver when they are in a car.
I never mention the '80's vehicles I have owned because I'm a purist.
I'm afraid I will be movin' on up(down), eventually.