A good starter choice is often a fixed-lens rangefinder like the Canonet QL17 GIII. It has a built-in 40mm f/1.7 lens and shutter-priority auto exposure, so it’s simple to use and well suited to street photography. Just be careful buying used: with older cameras, condition matters a lot, especially the light seals and general mechanical health.

If you want interchangeable lenses, Cosina-Voigtländer rangefinders such as the R2, R3, or R4 are strong entry-level options. They’re newer than many classic rangefinders, reasonably well built, have built-in meters, and use Leica M-mount lenses.

At the very low-cost end, a Zorki 4 with a Jupiter-8 50mm f/2 can be a cheap way to try rangefinder shooting. Image quality can be good, but quality control is inconsistent, so finding a properly adjusted body and lens is the main risk.

In general, fixed-lens models are the simplest and cheapest way to try film rangefinders. Interchangeable-lens models offer more room to grow but add cost and complexity. Since you may resell later, buying a known, working example in good condition is more important than chasing the absolute lowest price.