Application - Amerigon
The names of some OEMs who are using them:
DRIVING: BELLS & WHISTLES; The Hot Seat (Or the Cool) - New York Times
Potentially some junkyard opportunties here, although understanding how the system is configured and where/how its set up to move the heat/cool to/from would be reqiured to make sure you get all the necessary parts to the system from the donor car.