They do sell these through a link on this site but I believe they are out of stock at the moment. This could just be a seasonal thing though. I think Thompson & Morgan stock these and ship to Canada. Another one to try is Sutton Seeds... Not sure if they ship to the Americas though. Failing that, try ebay. Hope this helps?

Thanks Myron, I tried those leads but they do not currently list this type. Maybe they are seasonal.