HDMI Dummy Plug : ID 4247 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Eclyxun 1pcs Diy Standard Hdmi Welding Male Jack Plug 19 Pin Hd Cable Connector 19+1 Gold-plated Plug With Heat Shrinkable Tube - Connectors - AliExpress
Headless Ghost - A simple HDMI plug display emulator