I've found some live bootlegs, and demos from bands like Addictive, Mortal Sin, Frozen Doberman, Oppressor, Redeemer, Tyrus and Allegiance.
Although obviously not Aussie I happened across a site with about 8 or 10 Nuclear Assault live and bootleg recordings the other day. And a few months ago I found a site of live recordings from different gigs all over the world (there is quite a number of these site popping up now) which had a massive range of bands on it.