Wolfenstein The New Order steam key at its historically cheapest price for $12 AUD.
If you have more than 100 uPlay coins in your account you can go here to trade them for a 20% coupon. I thought this was quite a cool feature since in-game rewards are usually worthless. This would make the game $9.60 AUD.
Other potential deals include Far Cry 4 [uPlay, not Steam] at $24.97 but it oddly shows up as $35.97 when you try to add it. Nowhere as good as that price error a few days ago but I suppose it's better than nothing. Comes to $20 with the coupon.
Thanks OP, and welcome to OzBargain!
(Anyone want to chime in on estimating how low it'll go during the Steam sales?)