I used their online query form to ask who is distributing in Oz and got this reply (mid-June this year):
"Hello,
Thank you for contacting Minwax. We appreciate your inquiry.
Unfortunately, there are no locations in Australia you can find our products at this time. Our team is working diligently to make them available to our Australian customers soon.
Please let me know if you have any further concerns or questions."
Maybe if more of it asked who their distributor in Australia is, they might be motivated to do more....