My work upgraded my Microsoft Surface Dock to a Surface Dock 2. Firm on price.
Surface Docking Station for Surface Book and Surface Pro 3/4
Ports: 2 Mini DisplayPort, 1 Gigabit Ethernet, 4 USB 3.0, 1 Audio out
Includes Surface Connect cable and External power supply (included)
5.12 x 2.36 x 1.18 in (130 x 60 x 30 mm), 1.21 lbs (550g)