I bought a 167MT new over 10 years ago and have found it robust and reliable though as I'm getting older I do find it rather heavy. In the UK a few dealers still have new Contax bodies on offer mainly the RTS111, the RX (the original model surprisingly) & the Aria. You see them advertised in Amateur Photographer magazine.
All the early models along with contemporary Yashicas suffer from the peeling leather problem but substitutes can be got cheaply from cameraleather in the US and from someone in Japan.
Secondhand Contaxes can be got quite reasonably on ebay, especially common are the RTS, the 137MD and 137MA. You pay more at a dealers but then you get a guarantee.