HDMI signals go from a source to a display. I need a device
to go between the source and the display. This device would
save the edid of the display and report that back to any
source connected to the device whether or not the display
is on.

One response to a previous query of mine suggested a device
that costs about $100 which is too much for my application.

What would such a device be called so I can google for online
options?