My best $20 fixed-lens RF is the Lynx 14e. And it uses very cool LIGHTS for the exposure meter. That I got working after cleaning out the battery compartment, splicing the wires, and a little soldering. The GSN and GTN are not as easy to work on. And they do not go to F1.4.
The Canonet Ql17l is the best $10 camera that I have.