TECs used in ELS alone are gonna be a multi hundred million dollar market lol, guess who makes most of Bismuth and Tellurium..
funny the majority of tellurium goes into solar panels, and almost entirely to First Solar, so you can ask them to spare you some tellurium.
most of micro TECs are still going into pluggables tho, total market might shrink as one TEC controls more lanes and more powerful lasers.