Since I subscribe ro the Yahoo Group Dye Transfer, I know that someone has some large rolls od Panchromatic Matrix Film. I forgot just how much film is in a roll, but the price is $400 per roll.
The Panchromatic matrix film was discontinued by Kodak long befor the ortho matrix film. But both are discontued now. Aside from deals like this, matrix film is just not availible anymore. But, you can make your own.