Abe's of Maine 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, and Pentax, model no. 571109, for $824. Coupon code "LOYALTY15" cuts it to $809. With free shipping, that's the lowest total price we could find by $15. It features a 9-blade aperture, 24 - 70mm focal length, and more.