Amazon.com: BKFK 4K HDMI Dummy Plug - Virtual Monitor Display Emulator, Headless Display Adapter Supports up to 3840x2160@60Hz, 1080@120Hz DVI EDID Emulator (Single1) : Electronics
HDMI Dummy Plug : ID 4247 : Adafruit Industries, Unique & fun DIY electronics and kits
The actual HDMI Dummy Plug Headless Ghost Display Emulators haven't arrived yet." : r/techsupportgore
HDMI Dummy Plug(4K UHD) Headless Ghost Adapter,Virtual Monitor Display Emulator Compatible with Windows, Mac OS, Linux - Walmart.com
False Load HDMI Dummy Plug Virtual Monitor EDID Display Cheat Card with LED MDY-CO457-LED
Amazon.com: DTech HDMI Dummy Plug 4K Display Emulator Compatible with Windows Mac OSX Linux Support 4kx2k 2160P 1080p for Computer Desktop (fit-Headless, 2 Pack) : Electronics