I'd say 2+2's are pretty rare these days, but there is certainly still too many of them on the market to help move prices up. How many 2+2's did we get? It seems we sold lots of them here, the 2 seaters are definitely in smaller numbers. However good 2+2's are certainly rare, lots of tatty automatics with bad paint jobs running the stock L26 with the flat tops.
However once they decline further in numbers I think you'll see prices go up. I don't see any Z's on the road in Sydney these days. I'm lucky if I see a 2+2 let alone a 2 seater.
Even a 280zx is getting hard to find, I saw 1 for the first time in ages the other day.