The guy I mentioned says he's asked a few of his normal special order people, and had some positive responses so actually they are seriously looking into ordering a large special order of double X in 4x5.
I'm going to make a special forum thread for it but I figured since were talking about it anyway...
He doesn't have any figures yet, but said anyone interested, go here.... Fill out the form (simple form) and make sure you list ROUGHLY how many boxes you would want (I'm assuming they come in 50 sheet boxes like other kodak 4x5.
Anyone who is interested for real, fill it out, only if enough people fill it out, will he have Kodak do the actual math to find out how much it would cost, which takes them a little while because they're dealing with two different companies, the sheet film product sales company, that cuts down the film, and the movie stock company that makes the movie stock.