Haven't we had this argument before?
If we set up a "co-op" I am sure Customs would be interested in taking their cut...5% duty plus 10% GST. Importing a large amount would make it much more likely that someone will get a "lemon" and so have to organise getting it back to the manufacturer. The Australian suppliers also have stock that was purchased when the dollar was a lot lower.
I think all the points have been made before...