You sound like a parts hoarder like me. lol! Im bad!!!
I'm sure you already know this but you can buy a TECs dirt cheap on Amazon or eBay. This is just the ceramic junction itself, no driver, heatsink and or fan.
Years ago I bought a dozen just to play with, cost was like $30. They worked for a bit but eventually burned them all up, didn't know they had to be current regulated. Lol!