As one of its daily deals, B&H Photo Video offers the Sigma 24-70mm f/2.8 IF EX DG HSM Lens for Canon EF Cameras, model no. 571101, or Sony A, model no. 571205, for $599 with free shipping. That's the lowest total price we could find by $121. It features an 82mm filter, internal focus, and three aspherical elements. Deal ends today.