BuyDig via eBay offers the Sigma AF 18-35mm f/1.8 DC HSM Lens for Canon, Nikon, or Sony bundled with a USB Dock for the in-cart price of $649 with free shipping. That's $50 under last month's mention without the dock, the lowest total price we've seen, and $150 under the lowest total price we could find for the lens alone. The lens features a 72mm filter ring and nine diaphragm blades. The USB dock allows you adjust several features, such as lens focus, using your computer.