It might be an idea to compare prices in a country who imported and sold cameras from all over the world, for instance UK:
I have lost a 1979 copy of Photography which I remember, had an advertisment for Kiev 4, 4A, Zorki 4K and Fed; but looking at Zenit prices might still give something of a ballpark:
Camera User magazine, September 1974 prices in pound sterling as advertised:
Zenit E with Helios-44, 58/2, 29.40; 50/3.5, 24.50
Konica Autoreflex T3 with Hexanon50/1.7, 134.90
Pentax SP1000 with SMC Takumar 55/2, 108.95
Canon FTb with 50/1.8, 129.60
This should put them in perspective I presume.