Have a wander round your local garden store.
Potassium Nitrate is used in:
Some Stump Removers
But most important read the packet.
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In Canada you can get it at Early's for 8$ for 10 of
i boat 40 grams off of http://capricornslair.stores.yahoo.net/sapu40.html for $3.25 (but you can buy more)
You can buy KNO3 as fertilizer (the fertilizer contains usually 97% KNO3) or you can make it. 2HNO3 + K2CO3 = 2KNO3 + CO2 + H2OKNO3 + KOH = KNO3 + H2ONH4NO3 + KX = NH4X + KNO3NaNO3 + KX = KNO3 + NaXX can be -OH, -SO4, -CO3, -COOH.Or you can order it froma chem. supply shop (usually they sell 99,9% KNO3).
Unless you're a educator or work in a lab you probably won't be able to order this. Post 9/11 the DEA (drug enforcement administration) has restricted a lot of substances, normally you could order it from Wards Science, or Carolina Biology, or ScienceKit.Good luck.
Check out your local hardware store. I found some in the form of stump remover that is 100% KNO3. The only problem with this form is that it comes in small little balls, so you either have to grind it up or boil it down to get it to a powder. Hope this helps.