Potassium chloride and citric acid pure source

I found a good supplier for both on ebay but he wont ship to canada anymore. I wonder if these can be used for a nearly pure source of KCl.

http://www.rona.ca/en/potassium-chloride


Ill give my local farm supply house a call monday as KCl is something that is used as a fertilizer. Citric acid is a little trickier to find a non polluted source. Ideally I'd like to buy 5-10 lbs of each. If anyone knows a quality source please post here or send me a pm.