[Sal Santamaura]

...in 8x10 sizes, both Kodak Tmax 400 and 100 will no longer be manufactured. Such films will be available in 4x5 sheets. Thus, the only 8x10 Kodak black and white film that will be offered on a regular basis will be TriX and ONLY if the demand for such film continues...

I just confirmed that with Pete at Kodak Professional Products (Ext. 19). Kodak has also just discontinued TMX in 5x7, where 320TXP will be the only film available as a stock item.

It doesn't seem like the 10-sheet boxes of 8x10 were to blame, since 5x7 TMX continued to be packaged in 50-sheet boxes, to no apparent avail.