B&H has the new Sigma 150-600mm f/5-6.3 DG OS HSM Sports lens in stock and now shipping. Check it out here at B&H Photo.
Additionally, the new Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary lens is also expected in mid-March and will cost $1089. It will be available for Canon, Nikon, Sony A and Sigma mounts. It is also available for pre-order now here at B&H Photo.