Alan, don't know if this will help or not, but do you ever go to gardenwatchdog.com?
Once you're on the main page, you'll see a scroll-down-window listing different countries. Click on Canada..Numerous nurseries will pop up..
I can't say whether or not you'll find a nursery that sells Begonias, but it's a good a start as any..I've found some wonderful nurseries via gardenwatchdog..Good luck, Toni

Thanks, Toni. I will check them out. I am always looking for interesting nurseries.

Best,

Alan

Alan,
Home Depot frequently has rexes. I saw some at one location on Toronto just the other day. They keep them inside with the tropicals.
Plant World on Eglington in Toronto also has them.