There are usually a few floating around for sale, it's not an item everyone needs. Mike Mayberry has had one n eBay that hasn't sold for $24, that maybe an easier starting point, or replace with a modern one and upgrade your AC.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.