They are clamping down in Australia so people are not as open to talk about it.
Somewhat depends on where you are. Sydney I can tell that you would not have a problem getting almost anything once you are in the know.
Head to the "bodybuilders" gyms train there for a while and get to know the guys that are using - you should be able to tell who they are.
Just be a little careful and get to know your supplier first.