Amazon offers the Sigma 17-50mm f/2.8 EX DC OS HSM FLD Lens for Canon, Nikon, Sigma, or Sony for $219 with free shipping. That's $180 under our December mention and the lowest total price we've seen. (It's the best deal today by $200.) This large aperture lens features optical stabilization (except for the Sony mount).

Note that this items may take up to three weeks to ship.