Microsoft Surface Pro 4 Dock on Amazon at 11,73. Usually it is about 130.
Description from Amazon:
All the ports you need - with two high-definition video ports, a Gigabit Ethernet port, four high-speed USB 3.0 ports and an audio output
Lightning fast with minimalist design - surface dock uses surface connect technology which enables high-speed transfer of video, audio and data over a single cable keeping your desk clutter-free
Easy setup - surface dock is quick and easy to set up, connect your peripherals to surface dock and then attach the magnetic surface connect cable to your device