Not the cheapest it has ever been but cheaper than most stores.
If you would prefer C&C you could get it at Scorptec:
https://www.scorptec.com.au/product/monitors/25plus-inch/797…
Historical prices show that it was last at this price in Apr/May and the lowest was around 400 in Feb to Mar:
https://au.pcpartpicker.com/product/DjH8TW/viewsonic-vx2758-…
EDIT:
MSY also has it as $449 thanks to @s3n for local stock/ easy of returns and exchange
https://www.msy.com.au/viewsonic-27-vx2758-2kp-mhd-2560x1440…
or if you would prefer ebay it is around $400 with the code PTETE15 ends on 3rd of December. credit to @BjornMorrison
https://www.ebay.com.au/itm/ViewSonic-VX2758-2KP-MHD-27in-14…
EDIT 2:
I cant change the store but Mwave has it cheaper at $429
https://www.mwave.com.au/product/viewsonic-vx27582kpmhd-27-1…
I have this monitor and I was tempted to upgrade to the Dell S2721DGF for about $100 more but I've decided to wait for 240hz or 360hz displays to drop in price
This monitor is great overall but at 144hz and max overdrive there is overshoot so I have to reduce it to advanced
The Dell S2721DGF is just that little bit more perfect ie. to illustrate let's just say an overall difference of 6ms on the Dell vs 10ms overall average response on the VX2758-2KP-MHD according to RTINGS reviews