Following sylon's advice on his 3800X Bargain, found the same process works on this 10TB WD External Drive.
For 'Shuckers' this will usually contain a WD100EMAZ-00WJTA0 'White' Drive, with apparently a small chance of being a WD Red drive.
To get the right price, open the link above, then in the "Frequently bought together" Section at the bottom, deselect the other offerings, then "Add To Cart". Came through as $250.79 for me.
Not the cheapest it's ever been, but fairly close, and next cheapest offerings seem to be ~$300+. Maybe you could get Officeworks to pricebeat?