EDIT: Thanks to clarenix for pointing out that you can change the currency to AUD on the website. link updated. :)
Been waiting for this game to drop in price but with the incredibly bad exchange rate, its price hasn't come off that much in AUD terms. :(
For what it's worth, isthereanydeal shows that this is the game's best USD price thus far:
https://isthereanydeal.com/#/search:pillars%20of%20eternity;…
Change currency to AUD and the price would be 19.95.