Great value considering the Big Mac is $6.25 by itself.
In the McDonald's mobile app, simply click on Big Mac and then click on the 'Golden Meal' tab. Heres a screenshot
Here are some FAQs from the comments below:
Is this available at every Australian McDonalds restaurant?
No, but available at most.
Do I need an account to make an order?
Yes you must register an account and pay using a credit card in the app to place an order.
Can I pick it up in the drive-thru?
No, walk in only.
My device wont let me place an order?
After you have put in payment details, you must have GPS turned on your device and be very close to the restaurant to place the order.
Can I order multiples of this deal at once?
Yes there seems to be no limit in the app.
Can I swap out fries and drink?
Fries - yes, only to a salad.
Drink - heavy restrictions. Only able to swap soft drink to a soda water or peach flavoured ice tea
Brief overview on how the app works? Is it only a limited number of stores offering it?