I can only get the liquid concentrate here( no dry in the box type) or spray , and the only place that carries the conentrate in my area is Walmart . So every once in a while I have to go and stock up.
I like the concentrate as I get do "custom" mixes or strenght depending on the project and the fabric.
The only company I know that makes the liquid concenrate is Stay Flo... come in a blue plastic jug.