$599 from B&H Photo Video - No Tax unless in NY - Free Expedited Shipping
Looks like it may be in response to price drop of Oculus Rift.
Amazon also has this price but doesn't appear in stock for immediate shipment. Newegg also has this price but tax for many.
2160 x 1260 Total Resolution
Dual 90 Hz AMOLED Displays
Up to 11.5 x 11.5' Play Area
Two Vive Controllers Included
Two Base Stations Included