Well think you would need to work out exactly what you wanted to make
Iodophos (under one of many trade names) is Iodine and Phosphoric Acid, to buy anymore than a couple of grams of I2 solution (or heaven forbid Iodine crystals) you will need to fill out an EUD (end user declaration) as the powers that be are going to be quietly confidant that you are using it to make Speed, or nerve gas and you are very likely to get a visit from the boys in blue.
Star San is Phosphoric acid and an industrial detergent, in either case the minimum quantity you will probable be able to buy is 20Kg of each and I would suggest you don't muck about with pure Phos acid unless you know what you are doing! It's also very expensive as industrial chemicals go.
Be very careful which surfactant you mix with strong acids, some of the reactions can be very entertaining (when viewed from a distance)
For years I was selling 5Kg jars of pure Sodium Percarbonate cheaper than no name nappy wash - it was rated for contact with food processing equipment, so a grade or two purer than poo in nappy quality and didn't contain 70% mystery filler. I'm pretty sure that if you asked around a couple of HBS's some one would do you a 20Kg bag for a very reasonable price (that's how I now buy mine), once upon a time I was getting 1/2 a pallet of Perk and 1/2 a pallet of Pink delivered together which worked out pretty well.