At the moment most workshops are quoting around $4,500 plus tyres, etc. for all of the popular models including Supra, Soarer, Skyline (R32, R33 & R34), 180SX, etc..
Prices will possibly drop to around $4,000 once there are more compliance workshops around, but it is probably not worth waiting 2-3 months for the sake of only $500.
We will be updating the compliance availability page on our website as more workshops get approved, it will list all vehicle types that are currently able to be complied as well as the best prices we find in each state - www.j-spec.com.au/compliance