Pretty sure I can buy 30% or more from a lab supplier in the US. I can buy gallons of the 3% stuff with no issue too. The 12% stuff is usually in hair products, which I think has stabilizers or other additives in it. I use peroxide for European style mounts which is why I need so much of it. I decided 3% works fine and is way more economical than the powerful stuff even if it takes longer.