Since everyone is stirring up the pot, I'm an APUG sponsor.
I just order Ilford film from Wynit and they send it over. They've never asked me about special cutting in the ULF sizes but I do have some stock in HP5 in the following sizes... 4x5, 8x10, 11x14, 7x17, 8x20, 12x20. I usually have 5x7 as well but Tony Hauser bought all my stock yesterday.
In case your desperate.
-Rob