Since this is asked all the time and information seems to be sketchy, I decided to make this list of chemicals for the C-41, E-6, and RA-4 processes. This is not a definitive nor a complete list, but it will give you a place to go with a solid shopping list. If anyone has other locations or brands to add, please do. Alternatively you can PM me with the information and I will edit this post to reflect it once I check it out and verify it. The information I have is for North America, but I will add other countries if you send me a link.
For small 1L kits I would go with the repackaged Kodak kit from Photographer's Formulary or the Rollei kit from Freestyle Photo. In Europe the Rollei kits are available from Maco Direct in several sized kits or as individual parts.
Maco Direct also has available a 5 liter C-41 4 bath kit. Thanks to Diapositivo for the link.
For larger volumes it makes better economic sense to buy in bulk, in which case Kodak recommends their SM line of the Flexicolor chemicals. These can be purchased at mini-lab suppliers such as Photo Finishers Supplies, Inc. Orders are shipped UPS Ground and are calculated by weight. There are no HAZMAT fees. Or Pakor, which does charge HAZMAT.
The items needed for Flexicolor SM are:
Developer #KOC1756337 to make 6 x 2L
Bleach #KOC8824690 premixed 2 x 2.7L
Fixer #KOC8462681 premixed 2 x 3.9L
Rinse #KOC1925254 to make 12 x 1.5L
No developer starter is needed. Each chemical is sold by the case which include the amounts listed above. Instructions for use can be found on Kodak tech sheet CIS-211.
The items needed for Flexicolor LORR are:
Developer Replenisher #444-0364 1 x 5 gal.
Developer Starter #444-0375 to make 17.75 gal.
Bleach #444-0401 1 x 5 gal.
Fixer and Replenisher #444-0296 4 x 5 gal.
Final Rinse and Replenisher #444-1044 2 x 75 gal.
Instructions for use can be found on Kodak tech sheet Z-131. Thanks Ed Sawyer for the info.
Trebla brand chemicals are available from Armadillo Photo Supply. They stock some older package sizes, so the ones listed here are current and what will be carried in the future.
Items needed are:
Developer #55DE550 to make 4 x 10L
Developer Starter #55DE519 to make 1 x 1L
Bleach #55BL563 to make 2 x 5L
Fixer #55FX564 to make 2 x 10L
Stabilizer #55ST595 to make 12 x 10L
At one time Kodak made a 5L kit for E-6, but I am unable to find a supplier. If someone has a link to one, PM me and I will add it here. Bulk sizes are readily available at mini-lab suppliers such as Photo Finishers Supplies, Inc. Instructions for use can be found on Kodak tech sheet Z-119.
What you need:
First Developer Replenisher #KOC8313611 to make 4 x 10L
First Developer Starter #KOC1671577 to make 100L
Reversal Bath and Replenisher #KOC1123611 to make 4 x 10L
Color Developer Replenisher #KOC8372542 to make 5 gal.
Color Developer Starter #KOC1858158 to make 25 gal.
Pre-Bleach and Replenisher #KOC1286228 to make 6 x 10L
Bleach Replenisher #KOC1965623 to make 1 x 5L
Bleach Starter #KOC1779792 to make 25 gal.
Fixer and Replenisher #KOC1545466 to make 3 x 10L
Final Rinse #KOC8140279 to make 12 x 10L
Trebla E-6 chemicals are available from Armadillo Photo Supply with the following quantities. The site lists some older package sizes no longer available, so I only listed the products still in production.
What you need are:
First Developer #20DE260 to make 6 x 10L
First Dev. Starter #251-DE208S to make 1 x 25 gal.
Reversal Bath #20RV261 to make 12 x 5L
Color Developer #20DE262 to make 3 x 10L
Color Dev. Starter #251DE209S to make 1 x 25 gal.
Pre-Bleach #20CO263 to make 12 x 5L
Bleach #20BL264 to make 6 x 2L
Bleach Starter #251-BL210S to make 1 x 25 gal.
Fixer # 20FX265 to make 6 x 5L
Final Rinse #20ST266 to make 12 x 5L
I will post the information for Fuji-Hunt products if someone sends them to me. I will also include a link to dealers in other countries if you provide a link.
Available in Europe from Macro Direct is the Fuji Hunt 5 liter 3 bath kit.
For home use the best all around developer is Kodak RA-4 RT chemicals. The easiest I have been able to find small quantities is Calumet Photo. Instructions for use can be found from Kodak tech sheet J-39.
What you need:
Developer Replenisher RT #8415580 to make 10L
Bleach-Fix and Replenisher #8309031 to make 10L
Larger quantities can be bought from mini-lab suppliers in quantities up to 75 gallons it you are using large machines.
Maco Direct sells 1 liter Rollei RA kits, as well.