Crutchfield offers the Sigma 10-20mm f/4-5.6 EX DC HSM AF Super Wide Angle Zoom Lens for Canon EOS DSLRs, model no. 201101, for $379.99 with free shipping. That's the lowest total price we could find by $5, although most stores charge $430 or more. It features three SLD glass elements, a minimum focusing distance of 9.4", and angle of view of 102.4° to 63.8°.