You can try Farnell
http://www.farnell.com.au or RS Components
http://australia.rs-online.com/web/
I think I got most of mine from electrical wholesalers such as Lawrence & Hanson. I used Utilux terminals throughout to ensure compatibility. The expensive bits back then (15+ years ago) were the tools.
Edit:
A quick look at the Utilux webite shows they don't list moulded connectors any more. They have been bought by Tyco, who also own similiar companies, so maybe they've rationalised production.
I see another company Semico
http://www.semico.com.au in Sydney appears to be stocking similiar gear. By luck I'll be in Sydney for the next few days and will be staying a stones throw from Semico. I'll drop in and check them out.
Cheers
Geoff