In 1955 Geiss-America offered a modification to the Argus C4 which allowed it to use interchangeable lenses. Geiss-America Ad
Also in the same 1955 Photography Directory were some short descriptions and prices for most of the cameras made at the time. Here is one page for box cameras.
Also there was a nice early ad for Canon cameras.
The ad above is from the September 1949 issue of US Camera. You can get a larger view with the pdf. Ciro-Flex Model F
Lastly from the same issue is an ad for Bloom's Camera Center in Springfield MA. Like most independent camera stores Bloom's is long defunct. The ad does list a nice variety of new and used still and movie cameras.
Hopefully, the links to Google Docs work okay. If there are any problems let me know.