Check out these ones on carsales, if you don't mind slightly high kms if you're after a wrx.

http://www.carsales.com.au/all-cars/...=wrx&trecs=138

http://www.carsales.com.au/all-cars/...=wrx&trecs=138

The second one is actually listed here, I'm sure you'ld get the perth-wrx member discount :P