The new oppo find x2 pro, probably not as good as the telstra port deal but seems to be the best price so far for outright purchase. I think the back-order only applies to the orange but may be wrong.
Listing says AU stock with 24 months of warranty.
Listing for the black one says its in stock (at time of posting): https://www.ebay.com.au/itm/OPPO-Find-X2-Pro-5G-In-Stock-Now...
I think the biggest downfall of this compared to s20 ultra or oneplus 8+ is the lack of wireless charging/reverse wireless charging. But if you're in Australia, I personally think it probably beats both the s20 ultra and the oneplus 8+. Beats the Samsung Ultra+ because it's actually a snapdragon 865 and not the inferior enoxys chip. Beats the Oneplus 8+ because the IN2020 version (which is price comparable) doesn't have band 28 for 4g.