Looking for chinese yam and or comfrey bocking 14 for ontario

Hey all you amazing permaculture friends and peeps I am starting a new garden this year and in dire need of some plant material I really would love to find a source of Chinese yam or discorea batatas in Ontario and or comfrey bocking 4 or 14 f there is anyone out there that my be willing to share or sell these awesome plants please let me know I would love to here from you or have some feedback on where I can find these lovely beings. As a further note I just wanted to thank the people on this site for all the helpful and amazing advice I have received, over the short period of time that I have become a member people are extremely kind and willing to offer up help trades and advice from there experiences. thank yall and any feedback is awesome!!!

There is a couple on here and Kijiji advertising comfrey booking 14. They are south of Uxbridge and will ship.

You can buy nice-sized fresh Chinese (SHAN YAO) or Japanese (NAGAIMO) yam roots from an Asian grocer. I've had success planting NAGAIMO from the grocery store. Just look for a nice-sized, fresh-looking chunk. They aren't expensive either. Asian grocers or coops are great places to find plant starts. Other things that I've successfully planted are: ginger (organic from Costco); lemongrass, tumeric, chayote, Jerusalem artichokes, taro (from my regional store chain that that stocks more uncommon stuff); water chestnuts (Asian grocer).
I've also had a lot of failures but the monetary outlay is low so I'm willing to try many things.

I'm growing tropical Yams from one bought at an international market in the city and they're doing great.  Just cut the Yam into chunks, dusted with ash, and planted in composty soil.  They waited until it got nice and warm before they sprouted, but once planted out they are growing quickly.  My Chinese Yams grown from bulbils, on the other hand, are tiny and slow.  Not sure why. Maybe because the bulbils are so small compared to the chunks.