We buy entirely within the USA because that's good long term business.
Borax: It's old-fashioned and strong. Good stuff. Some places have mountains of it.
Castor oil: This has a reputation for making people gag, but it's strong.
Coconut oil: Coconuts add a touch of sun and softness to our product. Like chamfering the edges of a fine workpiece.
Nutmeg oil: Another good source of complex oils, that we normally use nutmeg as a spice, like in our egg nog. I have a killer recipe for egg nog, by the way
Potash (potasium hydroxide, or lye, or KOH for chemists): This makes the magic happen.
Soybean oil: Good base of many products, and very local.
Water (distilled): Simple enough.