Gus,
The few KPGC10 I was looking at was asking for about 1,800,000 Yen, they were in very good condition.
I don't think they are hard to find, actually I think anything is available in Japan, it is just a matter of how much they are.
Anything I mean very nice KPGC10, Toyota 2000GT to brand new zero miles R32 V-spec II, 400R.......etc......anything, but some of them are very expensive. Like a zero miles R32 V-spec II would be about the same price as a brand new R34 V-spec II.
Jeff