Where can I find agar powder in Calgary?

I've recently been trying to go vegan, and have some old recipe books that I got from the thrift shop that I want to try making vegan. Some of the recipes call for gelatin, and I want to try making them vegan by using agar powder instead.

I've tried Walmart, Superstore, Safeway, Sun Rise Health Foods, E-mart, and none of them seem to carry the powder. I found a place that sells agar packaged on it's own, but the packages seem small and costly for the amount of powder I'd likely get if I ground it at home.

Does anybody know where I can find the containers of it? I'm willing to pay a larger amount assuming it'll last a long while.

Thanks in advance!