B&H certainly still lists the 70mm Tri-X. I have a slightly expired roll I bought on eBay, which makes great 616 film.

But 70mm is surely doomed, since all the "school portrait" cameras it was used in are being scrapped for digital. Olan Mills did a photo directory at our church, and they used a tethered Olympus E1.

Slightly expired Portra 160NC in 46mm and 70mm is a drug on the market on eBay. Sometimes you have to buy several rolls at once.

The Aerial film minimum orders seem to be creeping up to an entire master roll. Practical only for the Military.