B&H has the Tokina 12-28mm f/4 AT-X Pro lens for $249 (reg. $449) for Canon mount in APS-C format. Check it out here at B&H Photo.
Tokina 12-28mm f/4.0 AT-X Pro DX Lens for Nikon in Stock
The new Tokina 12-28mm f/4.0 AT-X Pro DX lens is now shipping for Nikon DX DSLRs (like the D7100). Check it out here at B&H Photo.
It’s expected to start shipping in Canon mount next month.