A nice overview of compact fixed-lens range-finders of the seventies is here:


they look all the same at first sight, but further inspection reveal important differences among them.
Most of them would be good for your inexpensive category.
Don't overlook the need of a serious cleaning, lubrication and adjustment for a second-hand camera of this age.
Of this group I personally own a Canon Canonet 50/1.9 and I find the lens pretty good. The "quick load" mechanism is very well made.