Samsung has a Samsung DeX pad Dock for Galaxy Phones, $37.50 Free Shipping. Expires: 9/2/2018 - $80 at amazon.

• Samsung DeX enables you to turn your Galaxy smartphone into a true desktop computing experience.
• By docking your smartphone into the DeX Pad, your phone will launch a special DeX mode on the connected external monitor and applications can be opened in multiple separate windows.
• Connect a mouse or keyboard for added productivity or even use your phone screen as a touchpad.
• For Samsung Galaxy Note 8, Galaxy S8 and S8+ and Galaxy S9 and GS9+ with Fast Charge USB-C Wall Charger