Years ago when I lived down south,we bought several lots of fingerlings from hatcheries who advertised in the classified section of the "The Land"(a rural weekly nsw paper).The QLD version is the Country Life.
These are available from newsagents and might give you an idea of where to look.
It doesnt matter if they have to send them buy courier as they used to come in plastic bags full of water and the rest of air .They travel quite well.
Happy fishfarming
Scott