No idea what the dilutions on those kits are. If you can figure it out, let us know as they might be more economical than the other methods.

One place I have found all the chemistry and they will ship is Hazmat charges run fairly high via them and UPS for some things.

Adorama will sell and ship everything except the bleach, so that's another source.

A 5gal developer batch in my experience will process about 225 rolls of 120 or 35mm used 1-shot in a Super Sidekick. That's using the normal Flexicolor chemistry.