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Don't get a fed for your first RF unless someone practically gives it to you for free.
Get a non interchangeable lens rangefinder, they're still cheap and many times much nicer to use than an old copy of a pre-ww2 design.
Here's a bunch of suggestions:
Olympus 35 RC/RD
Konica C35
Konica Auto S2/S3
Canon Canonet QL 17/19/25
Yashica Lynx 5000/14
Yashica Electro 35 G/GT/GTN/GS/GSN
Yashica Electro 35 CC/FC/GL/GX
These are all cameras that can be found for under 100 bucks in good working condition if you look around a little, and they will all be nicer to use than a soviet rangefinder (Unless you find a nice Kiev because those are pretty sweet)