Adorama offers the Sigma 24-70mm f/2.8 IF EX DC HSM Lens for Canon, model no. 571101, Sony, model no. 571205, Nikon, model no. 571306, Pentax, model no. 571109, or Sigma, model no. 571110, for $699 with free shipping. That's $110 under our April mention and the lowest total price we could find by at least $56. It features a 9-blade aperture, 24 to 70mm focal length, and more.