I would recommend a Zeiss Ikon 520/2 Ikonta with a Tessar lens. These can be had for between $30 and $75.
If you want something cheaper, you can find one with the Novar lens.
The 520/2 is a zone-focus camera.
A step up would be the rangefinder-equipped 530/2 or 531/2 and generally a big jump in price to more than $200 and up to $400 or more.
If you don't mind respooling, you could consider a Nagel Vollenda 620 -- the 6x9 version or one of the many Kodak 6x9 folding cameras.
Prewar cameras will have uncoated lenses and most -- but not all -- postwar cameras will have coated lenses.
I forgot my standard line: Almost all of these cameras probably should be serviced. Common problems are gummed-up shutters, dirty viewfinders and focusing helicals that need to be cleaned and re-lubricated, and you should always check that the bellows are light tight.