You can now get $100 off when you bundle a Surface Dock with any Surface Pro 4 from Microsoft Store. This offer is available only today. You can turn your Surface into a desktop PC with a Surface Dock. With two high-definition video ports, a Gigabit Ethernet port, four high-speed USB 3.0 ports, and an audio output, you’ve got all the connections you need in a sleek, compact design.
Surface Dock is compatible with Surface Pro 3, Surface Pro 4, and Surface Book.
Find the deal here from Microsoft Store.