I've had my eye on this phone for a while now and this is the first time I've seen it under AU$500.
Customer reviews and photos appear to indicate this is the "official" global version which comes with EU charger/Global ROM and sealed English packaging….
You can also grab a seller coupon to save another couple of bucks and don't forget about 5% cashrewards.
I've already taken the punt (DHL shipping) and also purchased the following tempered glass screen protection (XDA peeps seemed to like it):
https://www.aliexpress.com/item/Original-IMAK-Xiaomi-MIX-2-S…
I don't know how long this price will last but I guess it's a holiday special and will be good for another day or so until Eternal Team are back from "Tomb Sweeping Day" vacation :)
https://www.travelchinaguide.com/essential/holidays/qingming…
Edit: price went up around lunchtime then dropped back down at around dinner time (8/4/2018)…. deal was expired then unexpired appropriately :)
Perhaps the price is coming down because of the Mi Mix 2S?