According to Kodak, this film is discontinued, so I'm not sure that the B&H catalog is up to date. Plus-X 2402 is still shown as available, though:
http://www.kodak.com/ek/US/en/Aerial...hite_Films.htm

Given that I still haven't come up with a project for the 40' of 70mm (perforated) TechPan I have in the freezer, I can't see myself using 500' of Plus-X. But I admit to being tempted by the 150' rolls of perforated Double-X on eBay.