Prices in Australia would have been at least 1.5x and the exchange rate in 1977 was about USD = 0.90AUD - back before the float and the days of the crawling peg.
I rented a 2 bedroom flat with my brother in 1979 at $60 per week so these MF cameras would have been about 4 months rent for the basic kit. I bought my first used car in 1977 for $1,500 (1972 Mazda 808) and during the oil crisis of that time I recall petrol rationing meant at certain times the spending limit was $2 per car. Ain't inflation grand!