Sams for Epsom Salts ($3 for 16 cups) and Baking Soda ($5 for 8? lbs). The calcium part is harder being that it is summer and de-icer isnt a big seller right now. Good luck.
IF you want to buy by the bag, try: http://www.harveysalt.com/prod01.htm
For the calcium chloride you can get the flake or the peladow.
Peladow is about 20% more concentrated than the flake and is the same or better purity.
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