Kinda sad, really. I wandered though the north and south St Lawrence. Found lots of Bob's Red Mill, another brand called Indigo. As far as I can tell Rube's get it's stuff from a mill in Scarborough. In the north market at the health food store they sell organic flours. The sales staff didn't know where it came from, pretty sure it was Canadian, probably from the prairies.
I'll keep looking, but I'm getting less hopeful.