I suppose I can only say they're in a Metro grocery in Ontario; for some reason, I'm thinking of a trip I once made to Cape Breton Island where I dropped into a Sobeys (which hadn't quite made it to Ontario then) and was charmed to see Coke in small glass bottles... Still, it seems plausible enough they'd also be in Alberta now too. I'm also sort of interested that you already knew about the Throwback drinks without seeing them in a store.