I wouldn't rush into buying one as people think they're rarer than a unicorn.
The Australian forums died in the arse about 2-3 years ago. There is an Australian Supra buy and sell group on Facebook that you'll see some decent options. In saying that people are still delusional with the current prices.
I've had people message me for 3 times what i sold mine for a couple years ago. I'm also looking to buy another one, but honestly I think its cheaper to buy a roller and rebuild it.
There are still a few oldies floating around that can give some details on a few cars. For example dont touch the purple t04z single thats on the market. its a mashed up lemon hence the 5th owner in 18 months is trying to palm it off.
After owning both the supra and GTR, I can say there is something about the big single supra that never lets go!
Take your time to look at whats out there. Go test drive them and inspect the cars to make sure your getting what your paying for.