Kadlubek's (fifth ed.) says EUR 80 for a Maximar, and EUR 60 to 90 for an Avus. Bergheils double that and up...

There will be variations with different lenses and shutters, different modelss with slightly different features and so on, but except for Bergheils with Heliar lens the price is remarkably constant.

I'm deliberately not fiving the prices in US $, since the exchange rate has changed in the time since printing - and these cameras are more common in Europe thus the EUR price is more stable.