Welcome to Geekhack!
Seeing as you're in Melbourne, PCCaseGear would be the first place to check.
Followed by MechKB in Sydney.
PCCaeGear used to have a good range, including RealForce boards, but that was a long time ago. They still have quite a few, but more mainstream brands.
MechKB has lots of odd keyboards, and still sells RealForce.
Apart from that, you'll need to order from the US, which is, as hkf indicated, where most of us get our keyboards from.