Yeah, it was the main ingredient in many of the fertilizer bombs that got some use in the late 90's(think McVeigh and OK city)

I will not used it. I buy it from OFE orchid supply, but I'm going to ask around my club and see what they say about it, maybe shipping is not going to be so bad. If it fits, its ship.

Potassium nitrate is a great oxidizer, therefore should be shipped as a hazardous material (Class 5.1, PG III) in quantities over 5kg, and cannot be shipped by air at all.

Thanks I didn't know about that.

Try your local hydroponic store, I carry it at my store in 500 gram tubs for less then $10.

This is an old thread but I am bumping because I found "food grade" Potassium Nitrate, by "The Science Company" on Amazon. But the more I read about Potassium, the more I wonder whether I should be adding it or minimizing it) ("K-Lite")