Offer made and accepted for $406 through Greentoe.com from an "authorized retailer". This lens retails for $449. I selected the Sony E-Mount but this alternatively comes as a Micro 4/3 Mount. If you aren't familiar with Greentoe: you select a price you'd pay for a product and give your payment information. Greentoe forwards this offer to their "network of authorized retailers". Your offer may be accepted or a counter offer may be presented over the course of the next handful of seconds to days (or nothing may happen). If you are interested in this new lens, it's a great way to get a deal. The lenses are USA versions and come with a USA warranty (not grey market).
From SIGMA's website:
A NEW SYSTEM FOR MIRROR-LESS CAMERAS
Category: Wide Angle Lenses
Typical Photography: Creative, Travel, Landscape, Wedding & Events, Family