There are many suppliers and installers of wooden floor boards in Perth.
One is Titan who supply "engineered" as well as solid wood floors.
The engineered is about half the price and does not get white ants however the solid wood is nicer, and a friend of mine just had it laid on her concrete floor in a beautiful West Australian wood.
Another supplier that I have heard of is BJ's in Osborne Park.
However, I am only going on hearsay with this reply.
There are a number of flooring companies in Perth. Lifewood sells floors which are engineered to reduce warping. They are pricey however they are good quality floors. If you are seeking something cheaper then you may wish to go bamboo.