After getting hosed by buying local pool store supply CaCl, I would STRONGLY advise anyone to NOT buy it unless it is lab grade. most of the pool places carry tech grade, and when I mixed mine with water, it formed a gross thick goop on the surface, and when I tested it for ammonia, it had high levels of ammonia in it. Not good for tank business. $50+the 35g of RO/DI down the drain (literally and figuratively).
I would just buy at the lowest rate you can get BRS' stuff at. Check to see if you can do a group buy with some people to qualify yourself for "preferred pricing" if you haven't done it already. Then next time you buy from them, your items get their second or third higher tier of pricing (lower price) on most items.