I feel your pain too! It is either difficult or very expensive to get parts in OZ - particularly in Brisbane.
I bought my P3P from a store in Melbourne, but it took about 3 weeks to turn up, while I got accessories from the US in 4 days.
I have also had amazingly good service from some Chinese on-line stores who even shipped the goods for free and they arrived less than a week later. Amazing. If you are not in a hurry, perhaps the overseas option can be good.
Happy flying and Merry Christmas