I'm posting this for the next person to come along with this need...
The Kodak distributor for all of north Mexico happens to be in the city of Chihuahua. Direchisa carry the full line of Kodak films and Chemicals. They carry a great deal of Fuji product as well.
They have a warehouse on site and have nearly everything in stock. I was able to walk in and bought fresh-dated chemistry and 5x7 Tri X today. They are located at Calle 47 & Ojinaga.
I still haven't found anybody that does MF or LF E-6 locally.