Need help from dosing experts

[Jaws]

I was just wondering where everybody thinks the best place to buy bulk chemicals for dosing is? I have a 700G total water volume system which will be SPS dominant so it's going to be pretty demanding on chemicals. I have a couple 3 stage Profilux dosers, one of which is a stand alone, and I plan on dosing Calcium, Alkalinity, Magnesium, and 2 or 3 other supplements that I'm still trying to determine which ones would be the best for my setup. I'm open to suggestions.

So I'm looking for suggestions on what chemicals you'd suggest I go with and where is the best place to buy them, preferably in Canada. I'm looking for a combination of quality and cost effectiveness.

Thanks in advance for anyone that can lend a hand