Sigma 17-50mm F2.8 EX DC OS HSM for $400 (C/N/A/P/S)

The Sigma 17-50mm F2.8 EX DC OS HSM lens is currently on sale for $400 with free shipping at B&H Photo in the Canon, Nikon, Sony Alpha Minolta, Pentax K, and Sigma DSLR mounts. Some of the options also earn 4% promotional rewards… Four of the five also go for $400 at Amazon (no rewards, the Sigma mount is not on sale)…