(the price here is so inexpensive, that even with shipping to Canada, it might be cheaper than anything you can get locally).
Of course it's fine to post links to sources! But just fyi, brewers yeast is not the same thing as non-active saccharomyces cerevisae.
Tzap, my apologies for not having yet responded. I needed to do a bit of research and in the meantime we had some major issues on the homefront here. I'll do my best to answer your questions in the next 24-48 hours (I'm working on a post now for someone wanting/needing to start the IP; hopefully I'll have a chance later tonight and tomorrow to get yours & hers finished).