There is a post on the LF forum that TMY-2 can't be found in sheets in Chicago. Something about photography students buying it all up. I recall in late 2007, that Kodak let the supply of TMY dwindle prior to introducing TMY-2. I remember, when Badger and B&H were out of stock for 8x10 TMY, I panicked and placed large orders with both of them. Wound up with a freezer shelf full of 8x10 when both orders arrived. I hadn't planned on THAT happening. Needless to say, I haven't yet tried TMY-2 and probably won't for a few more years.
I see this shortage as a good sign. If demand is exceeding supply for TMY in sheet film sizes that is a good thing. Or, perhaps Kodak is letting the supply of 10 sheet boxes dwindle prior to reintroducing 25 or 50 sheet boxes. One can always hope....
Moral of the story, you should purchase enough film to last you a year or two and when you get down to a six month supply, it's time to reorder. Between APUG and the LF forum, there have been a few posts by folks DESPERATE because they couldn't walk into their usual shop and pick up a box of their favorite emulsion in sheet film sizes.
In this economy EVERY retail business is practicing inventory control and let's face it, LF sheet film doesn't exactly sell a box-a-day.