John Lehman , Feb 21, 2001; 01:28 p.m.
B&H lists High Speed IR and Plus-X (under aerial films) and VPS in 100 foot rolls. They have discontinued Tri-X (or so their customer service people tell me -- 70mm "is no longer factory stocked and requires a minimum order of 36 rolls. Any amount over 36 rolls needs to be ordered in multiples of 18"). Ilford's customer service emailed me last fall that they no longer offer HP5+ in 70mm. Agfa offers three speeds of black and white 70mm aerial film (max speed ISO 200) in 30 meter rolls, but it is a special order item (I had a friend check in vain with several major German photo dealers last summer).
So basically it is HIE, Plus-X, or VPS