B&H Photo-Video offers the Sigma 17-50mm F2.8 EX DC OS HSM Lens for Canon cameras (pictured), model no. 583101, or Nikon cameras, model no. 583306, for $594 with free shipping. (Click through to "B&H" to see these prices.) That's $5 below our December mention and the lowest total price we've seen for either version. (Each model is a current price low by $15. Most merchants charge $640 or more.) Features include FLD glass elements, anti-shake, 11" focus, 1.5x magnification, and more.