The Tamron SP 45mm f/1.8 Di VC USD full frame lens for Nikon F-mount is currently $200 off at B&H, Adorama and Amazon (price: $399, reg. $599).
See all Tamron lenses for Nikon F-mount with instant savings.
Tamron SP 35mm and 45mm f/1.8 Di VC USD lenses for Nikon F mount announced
Reviews of the Tamron SP 35mm and 45mm f/1.8 Di VC USD full frame lenses
Tamron SP 45mm f/1.8 Di VC USD lens for F mount tested at DxOMark: “tasty prime for Nikon FX“