B&H has the Tokina 11-16mm f/2.8 ATX Pro DX-II lens for $479.95 (was $525). It is a popular and highly-regarded lens for APS-C cameras and is available for Canon, Nikon and Sony A-mount cameras. Check it out here at B&H Photo.
Adorama has the Tokina 11-16mm f/2.8 ATX Pro DX in Nikon mount for $499 (reg. $589) as its Daily Deal. Check it out here at Adorama.
The new Tokina DX-II 11-16mm f/2.8 lens for Canon and Nikon mounts is now available for pre-order at B&H Photo. Retail is $739. Note that this lens is designed for use on DSLRs with an APS-C sensor and not full frame sensors.