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US$50 = ~AU$65.61 value
Get the 5% off via FB Like (link can only be accessed when on desktop, not mobile)
Make sure you're signed in @ CD keys when entering the discount code
CDKeys currently has $50 US gift cards on sale for AU$55 with the 5% off discount code. This makes it even cheaper to buy games from the US store where you generally get a better price then buying from the AU store already.
To redeem the code change your Xbox Ones console region to the US, or on Windows 10 you can change your PCs region to the US and redeem it through the Windows Store.
Don't mention CD Keys on here. All the goody two shoe I'm holier than thou people will start to neg you for not paying full and overpriced prices for game keys or other keys.