Most of us are aware of Strictly Ham http://www.strictlyham.com.au/
As well as Andrews Communications http://www.andrewscom.com.au/amateur-radio
and TET-EMTRON http://www.tetemtron.com.au/
But you May not be aware of TTS Systems http://www.ttssystems.com.au/products/
A company run by Dave VK3JKY and Claureen VK3KMB they seem to stock a good range of bits and pieces.