Dunno... I make it myself by the gallon. We don't use it for internal use for humans, so I'm not paranoid about whether or not it's a "true colloid". It WORKS. And I can make a quart in 10 minutes, for pennies (or a fraction of a penny... I've been using the same 1 ounce bar cut in half for 10 years now... there's still lots of silver left!)
The silver impregnated bandaids can be found at Walmar, almost certainly at Amazon, and
www.Jefferspet.com has "vetwrap" with silver impregnated pads on them. Really great for livestock- or people! LOL! and a LOT cheaper than the ones sold for humans...
http://www.jefferspet.com/pet-flex-s...ing/p/0034881/
Summerthyme