SZBITC 16x16 HDMI Switch Matrix 4k 3840x2160@30Hz Video Switcher Splitter EDID, HDCP, RS-232/WEB ,with Remote Control - AliExpress
Plugable DisplayPort to HDMI Passive Adapter (Supports Windows and Linux Systems and Displays up to 4K UHD 3840x2160@30Hz) - Walmart.com
Amazon.com: 3x3 Video Wall Controller 3840x2160/60HZ 4K with Media Player Splitter, Support HDMI 4K@30HZ Input, 1080/60HZ Each Output, IR Remote+Voice Control+RS232, Edge Masking, 3x2 2x2 3x1 2x3 4x2 2x4 Mode : Electronics
Amazon.com: DEFACE Video Wall Controller & Player 2x3 4K 3840x2160@30Hz Processor HDMI 1.4 HDCP 1.4 Support 1x2,2x1,2x2,2x3 with 1 HDMI Input 6 HDMI Output : Electronics
Plugable DisplayPort to HDMI Passive Adapter (Supports Windows and Linux Systems and Displays up to 4K UHD 3840x2160@30Hz) - Walmart.com
Tripp Lite 4-Port 4K HDMI Video Splitter Ultra-HD 4K x 2K w/ Audio 3840x2160 @ 24/30Hz
Szbitc 4k Hdmi Matrix 8x8 Hdmi Switcher 8 In 8 Out 3840x2160@30hz Tcp/ip/panel Button/remote Control For Hdtv, Monitor - Home Theatre System - AliExpress