It is not surprising. Contax T, T2 and T3 are very good cameras.
Interest in film and film demand is increasing.
The demand for lots of very good cameras is increasing.
That leads to increasing camera prices for those cameras.
But currently still quite a lot of cameras are much underrated. You can get them still at extreme bargain prices (e.g. Nikon F80, F90X, F100, F5; Canon EOS 1n, EOS 1V, EOS 30/33V, EOS 300X, Minolta Dynax 7 and 9, Dynax 800si, the Rolleiflex 6000 series, Mamiya 645 Pro TL, the Zenza Bronicas, Leica R4, R5, R7).
Excellent time for buyers, and currently it is the best time to built up your complete system, with main camera and second camera (or backup).
Now is the time to buy. It will not become cheaper!
In the coming years the used film camera prices generally will rise with the increasing interest in film and its revival.