Any of these cameras will need work, if only a cleaning, due to their age. You can get a Contax II w/o lens, in need of CLA and shutter tapes for ~ USD 100, there's one on feepay BIN for USD 75 right now. A Leica II or III will cost more, say ~USD 150-225, needing CLA and curtains. If you are able to do this kind of work, there's a lot of bargains out there.
Originally Posted by Xmas
Having seen first-hand what sometimes passes for a CLA, I'd not purchase a camera advertised as freshly CLA'd unless the seller could document the work was done by a skilled and reputable person - then I wouldn't buy it anyway, because I can do the work myself and I'm cheap.