Optus Australia is currently giving away a 1TB Xbox One with every purchase of the Lumia 950 and the Lumia 950 XL. All you need to do is buy either handset from the carrier, which is offering monthly plans starting from AUD60 ($43) for the Lumia 950 and AUD64 ($46) for the 950 XL.
The Xbox One that's included with the handset comes with a 1TB hard drive, and also includes a digital download code for FIFA 16. You even get a one-year subscription to EA Access. As deals go, it doesn't get much better than this.
Best act fast if you're interested, as there are only 91 Xbox One bundles left as of this writing.
Thanks Sean, nikhilr, Richard and Simon!