MOD: Coupon code removed. You need to get your unique coupon code from Green Man Gaming's Facebook page — click on "Get your code" to get your unique coupon code. Thanks to juszzy.
Saw this pop up on my Facebook feed this morning. I already got the game but I attempted to see the pricing and you have to add the code at the checkout stage for the discount to apply using P77VE3-3PGSD0-NWPX3G.
If you haven't got the game, for the original price it is worth it. For this price, it is definitely worth it.
USD 21.89 / AUD 27.76