Thanks to original 20% off deal post here https://www.ozbargain.com.au/node/648890
This price is ~$700 standard 'good deal' pricing, and the cheapest I've seen it.
Excellent lens for portraits. Ranked as very sharp, a superb E mount lens. I use it on my APS-C and it can be used as a tele-portrait or for action from further away. Good size and handling, with customisable button for focus hold etc.
Sony Online has this lens for $674.10. Currently there is 8% CashRewards. Also, some Amex card holders have $60 off for purchasing from Sony.
https://store.sony.com.au/lenses-full-frame/SEL85F18.html