If you're an eBay Plus member, this is cheaper than the Optus deal and you get dual SIM (although you might be lucky to get a price beat on the Optus price at OW).
Specifications
Processor: MTK Helio P90
Battery: 4035 mAh
RAM: 8GB
Storage: 128GB
VOOC Flash Charge: VOOC Flash Charge 3.0
Display: 6.4" AMOLED
Rear Camera: 48MP & 5MP f/1.7 + f/2.4
Front Camera: 32MP f/2.0
FDD-LTE: Bands 1/2/3/4/5/7/8/18/19/20/26/28
Bluetooth: 5.0
WLAN: 802.11 a/b/g/n/ac
NFC: Yes
USB: Type C
Fingerprint: under display
OPPO Reno2 Z 128GB/8GB (Black/White) $526.14 Delivered
I upgraded my Reno Z for this when JB Hi-Fi advertised the wrong price back in December.
Very happy with its overall performance. Some might prefer the Xiaomi Mi 9T apparently coming up for $399, but it's worth noting that the Oppo has a micro SD expansion slot, 2GB more RAM and a better under screen fingerprint reader.
Specifications
6.5" AMOLED 1080 x 2340 screen
128GB storage
8GB RAM
MTK Helio P90 processor
16MP front facing camera
48MP/f1.7 + 8MP/f2.2 + 2MP/f2.4 + 2MP/f2.4 rear cameras
Pop up front camera, no notch back camera.
Bluetooth v5.0
4000mAh battery + VOOC 3.0
Hidden Fingerprint Unlock 3.0
NFC
Headphone Jack
Micro SD slot
A shame about the proprietary fast charge, other than that, great specs to price ratio.