B&H will still get these for you but they will not ship.
I'm about to bribe my buddie up in the City to go over there and send me maybe 2 kits.
I've looked at assembling the chemicals individually but that is even more of a nightmare than figuring out sources for C41 (bleach being the hardest to find)
Adorama will ship and has some but not all the chemicals and sometimes will stock part A of a solution but no part B or C if needed.
I think the best bet is to look to a minilab supplier.