Amazon.com: HDMI Splitter 1 in 4 Out, MT-ViKI 1x4 Power HDMI Splitter 4 Ports w/AC Adapter, 4Kx2K@30Hz 3D Full HD Distributor for PS4 Fire Stick HDTV : Electronics
Amazon.com: 4K HDMI Switch 4x1, 4 Port HDMI Selector Switcher 4 in 1 Out with IR Remote Control Support 4K@60Hz, 4Kx2K, HDR, HDMI 2.0b, HDCP 2.2, 3D, 1080P : Electronics
Philips Hdmi Cable Extension Adapter, Full Hd 1080p & 4k - Black : Target
IOGEAR - GHDSW4K4 - 4K HDMI Switch
HDMI 4 Pi - 7 Display 1280x800 (720p) IPS - HDMI/VGA/PAL/NTSC : ID 1033 : $159.95 : Adafruit Industries, Unique & fun DIY electronics and kits