NETGEAR Orbi Whole Home Mesh WiFi System with Tri-band – Eliminate WiFi dead zones, Simple setup, Single network name, AC3000 (Set of 2)
RRP is $749. Currently $598 at JB Hi-Fi: https://www.jbhifi.com.au/computers-tablets/networking/netge…
Currently out of stock, though I'm pretty sure it'll be back in stock soon (should have by Christmas, don't get mad at me if you don't though). If you find a better deal, you can cancel the order as long as it hasn't shipped yet.
Note this is the RBK50. It has a 4x4 802.11 ac dedicated backhaul vs the RBK40's 2x2 802.11ac, plus a usb port (of questionable use). Details here: https://kb.netgear.com/000038220/Which-Orbi-WiFi-System-is-b… . The RBK40 can be had for USD $229.99 plus $20.54 shipping, about AUD $329.18 total. I think the RBK50 is worth the extra $15.
While I just saw Netgear advertise this on Facebook, if it's out of stock at Amazon at a great price in my experience you don't get the item.
Though nothing lost trying, unless you need it ASAP I guess.