BuyDig via eBay has the Sigma Art 18-35mm f/1.8 DC HSM for Canon for $599.99. This is the same price we saw on Black Friday and it is the lowest price we’ve seen for this fantastic crop-sensor lens. Nikon mount is also available.
It comes with a free Sigma USB dock. This is discounted $200 from regular price at B&H and Adorama.
BuyDig is an authorized Sigma USA dealer.