Sigma 50mm f1.4 ART (Nikon) with extras for $900

The Nikon version of the Sigma 50mm f1.4 SLR Art lens is available as a special bundle at Adorama for $900 with free shipping. The bundle includes these bonus items: 3yr New Leaf warranty (in this case, it is included automatically, you don’t have to add it manually), 77mm filter kit (UV, CPL, ND2), lens wrap, capleash and cleaning kit. Only this Nikon bundle is going for $900. The other versions go for $950… I don’t know if it is a price error or a specific sale or a price-match.