As one of its daily deals, Roberts Camera via eBay offers the Sigma 17-50mm f2.8 EX DC OS HSM Lens for Canon Cameras
, model no. 583306, for $429.99
with free shipping
. That's the lowest total price we could find by $139. Features include FLD glass elements, anti-shake, 11" focus, and 1:5 magnification ratio. Deal ends today.