B&H has the Tokina AT-X 11-16mm f/2.8 DX-II lens for $599 after instant and mail-in rebates (reg. $699). This is a pretty popular wide-angle lens amongst APS-C shooters, and it’s available for both Canon and Nikon lens mounts. 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.