I used to get it from Chang's Photo Supply (Los Angles) from its Hayward (Bay Area) warehouse. I believe the Hayward warehouse is long gone. Chang's web site is also gone indicating its business is possibly gone too. Chang's Photo Supply was a fairly high volume wholesaler for minilabs in California. Now I do not know where to get C-41 and E-6 chemicals any more. I am not looking for small sized packages. I am looking for packages like 5 gallon, 10Lx4 or even 25 gallon developer (LORR replenisher in particular). Adoroma only has the 5 gallon regular C-41 developer. It is a little small and not LORR. I would rather buy from a minilab supplier in Northern California. Does anyone know if there is such a supplier around here?
Contact CPAC. Their chemicals are to mix either 5 liters or 10 liters. I use the ColorPAC that stored for at least a couple of years and get very good results. They would connect you to the distributors. They carry CN-41, RA-4, E-6 and BW chemicals.
A photo amateur
Sinar P2/F2/Nikon F100/Bronica ETRSi/GS/Saunders 4550XLG/Jobo CPP2/CPE+/Colorline 7000