I'd avoid interstate buy personally. Because by the time you arrive there, you are already in a passive position, and likely to compromise.
I bought mine from a BMW dealer (just traded in a couple of days before I spotted the car), I was the first to test drive and seriously negotiate with sales (with a MY15 X3 as trade in).
Mechanically I won't worry to much about the M2 as they should still be covered by factory warranty (if there is anything wrong, discover fast and get it fixed before warranty expires).
Are you looking at this in QLD? ->
https://www.carsales.com.au/dealer/d...AG-AD-15434287