Update: The deal has now expired.
Fallout 4 is currently five bucks on Amazon Australia at the moment – which is pretty bloody cheap. It's unclear how long the deal will last, and if you're not a Prime subscriber you'll need to pay postage, but even then it'll likely come in at a tiny bit over ten bucks.
The deal is here, and if you're still in the mood for picking up some dirt cheap games, Steam is currently running a sale on all Game Awards nominated titles for, presumably, the weekend. You can check that out here.
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