As a back up Camera for my nikon F80 ,I have two Yashica`s.
a FX-D quartz and a 108 MP ,although they dont come up to the nikon in terms of quality etc they are both good cheap cameras.
You can pick them up cheap on ebay.
I have a 28-50mm 42-75mm 70-300mm and 75-310mm? lenses ,2x converter ,m42 adapter (useful for mounting on a telescope)Contax moter drive unit and a few flashguns.
all lenses are yashica apart from the 75-300mm (I think that is a early Tamron).
The lenses are interchangable with contax Cameras ,so the Carl Ziess (ooppss spelling)lenses will fit.
The FX-D is built like a brick out house and will take sever abuse before it gives up.