Microsoft said sales of its Xbox One doubled in June after it unbundled the console, allowing for a cheaper price. The Washington state-based company said it saw a strong spike, particularly in its $399 offering launched on June 9, down from $499. With add-on bundles including the motion sensor Kinect, the unit can retail for as much as $800, though. Both Sony and Microsoft introduced their next generation of gaming consoles in November last year, but since, Sony’s PlayStation 4 has blazed ahead as the sales leader. Worldwide, Sony has sold 9 million PS4 units, ahead of Microsoft's 5 million Xbox Ones. TheStreet's Keris Lahiff reports from New York.