He posts here once in a while, but I can't remember his handle. It looks like all his work is crossprocessed expired film and maybe he'll tell you his source.
Well, I checked one freezer and I have a 100 foot roll of 35mm Ektachrome Slide Duplicating film (1980's stuff) and a 100 foot roll of Konica Impressa (color negative - circa 1999). Sure you don't want any 40mm AGFA 160 color negative in unperforated bulk rolls (2000 Expiry)? I also have some individual 35mm rolls of Fuji Superia color neg (1990s stuff). If you want any of it, pay the shipping & it's yours. Send me a PM and let me know.