I've been developing B&W negatives at home for several years now. I also live in a city where there are no C-41 labs left, so I'd have to ship my film to be developed, adding extra cost (more than the cost of rolls themselves).
So I did some research and found C-41 isn't much different from B&W (dunk the film in a series of baths), save for the tolerances of temperatures, particularly in the developer (a non issue for me, since I can easily build a very accurate, PID-controlled water heater without much complication).
The problem is that there is no "user friendly" C-41 kits here in Argentina. All I could find were Kodak chemicals, designed for commercial use. These are the catalog numbers available:
(REV: developer, RELL: replenisher, BLANQ: bleach, FIJADOR: fixer, INICIAL: starter)
The chemicals are not terribly expensive, just $5-$8 USD each, except for the bleach which is very expensive, nearly $100! I've been reading some kodak PDFs and it seems it's not terribly difficult to mix them.
Is it worth it to try doing it with these? Do the concentrates last at least a couple of years to justify the cost of buying "commercial quantities"?