Adorama has the Tokina 14-20mm f/2.0 AT-X Pro DX as their Deal of the Day for $369 (Reg $499).
The Tokina AT-x 14-20mm PRO DX is a wide-angle zoom lens with super-fast f/2.0 aperture. This is the fastest lens ever made by Tokina. The lens is designed for use with Canon DSLR cameras with APS-C sensors.
Super-wide 14-20mm lens for cameras with APS-C sensors
Extremely fast F/2.0 constant aperture
3 Aspherical lens elements to for superior sharpness and contrast
4 Super-low Dispersion glass elements to control chromatic aberrations
Fast, Quiet Auto Focus
Common 82mm filter thread of use with circular PLs and other filters.
Tokina 14-20mm f/2.0 AT-X Pro DX $369 (Reg $499)