USB 3.0 to 4 HDMI Adapter - Quad Monitor - USB-A Display Adapters | Display & Video Adapters | StarTech.com
j5create | USB-C to 4-Port HDMI Multi-Monitor Adapter
Quad HDMI Input Full HD 1080P Input Expansion Card For VeCOAX ULTRA BT Broadcast Chassis | PVI ProVideoInstruments.com
Amazon.com: FERRISA 4x2 HDMI Matrix Switch,4 in 2 Out Matrix HDMI Video Switcher Splitter +Optical & L/R Audio Output,Support Ultra HD 4K,3D 1080P,Audio EDID Extractor with IR Remote Control : Electronics
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HDMI CAT Extender 4K120 – 40m (HDExt4K120)
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HDMI splitter, 4 ports (DSP-4PH4-02)
IOGEAR - GHDSW4K4 - 4K HDMI Switch
Micro HDMI (type D) to HDMI (type A) Cable - 3.5ft for Raspberry Pi 4 | eBay
4 Port RCA to HDMI Converter, Dual AV to HDMI Converter Supports 16:9/4:3 Composite to HDMI Adapter Support 1080P PAL/NTSC Compatible with Sega/Xbox/PS1/PS2/PS3/WII/N64/VHS, VCRs, and DVD Players - Newegg.com
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Best Buy: Dynex™ 4' HDMI Cable Black DX-SF109
SANOXY 4 x 1 HDMI 1 in 4 Out Switch SANOXY-DSV-HDMI-SPLT-1X4 - The Home Depot