I'd have to look up the name
There is a raw chemical supplier in calgary, Univar I think. I bought a 25kg bad of mag chloride from them (about half the cost was shipping). I think it worked out at around $1-2 per kg or so. If I remember Calgary and Winnipeg are where they actually warehouse it, as I couldn't get it from Vancouver.
I don't remember the cost breakdown, but I'm sure the mag was under $1 per kg without shipping.
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