Greyhound Bus freight for boxes.
I recently moved some stuff from Cairns to WA. I packed up my storage shed and had 3 tea chest sized boxes (60 by 40 by 40) weighing 23kg each and it cost me $120. It took about 10 days but the boxes turned up in good shape.
This may not be what your after (particularly for big things) but it may be of use to other folks in GA - who move around a lot with little money!
Swift