Best Buy has rolled out a special deal on the Xbox One where, if you buy a $399 system, you will automatically receive a $50 Xbox gift card for free. The deal is only valid for the $399, no-Kinect version. There is no indication as to how long the deal will last, so you may want to act quickly.
You'll need to add the system to your cart to see the free $50 Xbox gift card.
The $499 Xbox One system (with Kinect) comes with a free copy of Forza 5 at Best Buy. And of course, Best Buy--and other retailers--continue to sell the $499 Xbox One Titanfall bundle that comes with a system, Kinect, and a copy of Respawn Entertainment's shooter.