If you are interested in right hand drive Z's try UK.Often cars for sale here You can find list of clubs in the links on this page. Long time ago I even saw some japanese clubs with cars for sale. d'ont remember the price. (I had a friend at a japanese company here in europe who could translate)
were in australia are you ?
theres a fellow in my local area that has a heap of 240z s but he seams to be collecting them because every time i drive past he's got anouther in his yard
don't know if any are for sale or not.if i had some spare cash i would stop and see
but seing i would only be tyre kicking i'll save myself the imbaresment.
Last time I was there, the Z Car Workshop, Underwood, Q., had a very nice RB30ET conversion 240 for sale, around A$16,000...... Hello?.........Hello?.......Would cost a lot more than that to build. There is also a red one around with a Chev 350 engine, built as a show car.
Anyway, watch out for rust. Usually better off buying something that someone else has spent zillions on the body.