Was watching this YouTube video and saw he partnered with PlayStation to give 50% discounts on the game since there is a tournament running. Isn't the cheapest it has been but still a hefty discount.
There is also a discount for the US PSN version using this code: BJHFN468DR
I haven't tested this but if people are willing to login to the US PSN and download it, the cost will be around $41AUD.
Edit: If the code doesn't work for you, try a different browser or even try through the PS App.