B&H has the Sigma 85mm f/1.4 DG HSM Art lens for Nikon F-mount on sale ($350 off) as a part of their Deal Zone. This offer is valid only for today.
Update #1: get another $50 off with coupon code YOUGO2BH at B&H only
Update #2: this deal is now also available at Adorama.
Check also the new Nikon lens-only lens rebates that started yesterday in the US:
