Old thread but I bought a car (BMW actuially) via Private Fleet (
https://www.privatefleet.com.au/ a couple of years ago which they ended up sourcing from Sydney. I had the option to drive it on a 30-day permit (!) but instead they trucked it which, i believe cost around $1500. My rep told me they do it all the time as the WA BMW dealers in particular don't budge on pricing - seemd I saves over $4K on what i could get local.
However, all that said, I think this loophole m,ay have been closed cuz last week i referred a mate to Private Fleet to do the same thing and they said BMW Oz are enforcing a personal handover at the dealers. So fly over, meet the dealer, seal the deal, then fly back and wait for the truck! (or drive back)