I made a mistake, usually it is potassium chloride.

https://www.amazon.com/NoSalt-Sodium-Free-Salt-Alternative-Ounce/dp/B0183RU7VI

https://www.amazon.com/BulkSupplements-Potassium-Chloride-Powder-Kilogram/dp/B00ENS39XK/

https://www.amazon.com/Nutricost-Potassium-Chloride-Powder-1kg/dp/B097X3QW99/

Windsor salt free salt substitute is another one but isn’t on amazon.com.