I live near Freestyle and go there all the time. I asked about the Arista/Ilford thing and once got this response:
It IS Ilford, repackaged, the way Whirlpool washers are also Kenmores, and All RCA TV's are really Mitsubishi's or something else. But...
I was told that Arista gets the stuff at such a deep discount because it takes "ends" of rolls of film. Same film, emulsion, etc. Just (supposedly) the first few feet of a huge roll, or the last few feet.
For what it's worth.