B&H Photo Video and Adorama both have the Sigma 150-500mm F5-6.3 DG OS for $899.00, after a $170 instant savings. This is the lowest price we’ve ever seen for this lens; the stores are also offering 4% rewards ($36). Adorama is throwing in a free UV filter.
Sigma must be under pressure due to the recently announced Tamron SP 150-600mm f/5-6.3 Di VC USD which was introduced at $1069 (and is shipping starting tomorrow).