It’s more or less in the video title in this case (“$100 Custom LCD Design”) :) but he in the video itself he says it was $138 for five prototypes. Does not exactly fill me with joy, but even prototypes of CNC parts are usually an order of magnitude more expensive, from what I can see. Simple custom PCBs (which you can have for an order of magnitude less) are an outlier in this respect.

(Like the guy or not, but he’s not the filler type of YouTuber, not even from the enjoyable-filler variety. The LCD videos in particular may not rise to the level of a lecture series exactly, but they’re not far away from it, either.)