Dell Small Business offers the Dell D3100 USB 3.0 Triple Display UltraHD Dock, model no. 5M48M, for $99.99. Coupon code "SAVE90" drops it to $79. With free shipping, that's $16 under yesterday's mention and the lowest total price we've seen. (It's the best deal now by $47.) This video dock connects up to three displays to a laptop at once, including one Ultra HD 4K display and two full HD displays. It features three USB 3.0, USB, DisplayPort, two HDMI, Gigabit Ethernet, and 3.5mm audio and microphone ports. A 2-foot USB 3.0 cable and HDMI to DVI adapter are included. Deal ends December 5.