the Leica IIIf price seems to be quite fluctuating.
I tried to buy one but my parents never allowed me to :'(
In December 2004, you could get a BD with a Summar 2/50 for 250€.
In March 2005 it was the price for a good BD body.
In May you needed 300$ for a the same
then the prices exploded. 4, 5, 600¤ for a body only. In the same time, the cost for a summitar would jump from 80-100 to 200+ $, even more for an Elmar, not talking of the Summicron.
I think it reached its paroxysm between September and November. You then needed 600$ for a good RD, even more if mint.
And between November and now, the prices fell, from 700 to 200 or so.
But it seemed it was a general trend. When a camera is suddently known as a wow camera, it price jumps, by 3 or 4 times sometimes. Ex : I bought my first Rollei T for 200$ in september 2004. I bought the second one in August 2005 for 350, but it was a bargain for ebay prices were alreay around 500$!! now prices plunged and returned to what they were in 2004.