Where to buy Potassium Nitrate (saltpeter)?

I hear it's nearly impossible to find it in Ontario, Canada. Does anyone know where I can find it? I hear that you can get it at garden stores, being sold as "Stump Remover" and I'm wondering if that's true?

please check with the website of agrium.com. this is used to get KNO3 in canada
try the local prison
Why do you really want to posses Potassium Nitrate?

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