Here it is here for $10
This is sodium percarbonate. These are the only 2 things I use in the brewery.
A one hour soak in sodium percarb to clean your used FV or bottles, equipment etc then an application of the no rinse sanitser before brewing on everything/anything that touches the brew.
The percarb I use @1.2g per liter. This is coopers application rate and it does the trick. You can use more if you feel the need to, you cannot really over use it, but you'll just be wasting it. Sodium percarbonate is the active ingredient in napi-San so find a cheap no frill no scent napi san and use that.