I know Ryan of Corolla Tropicals from another forum. Unfortunately I have tried emailing him lately without success.
There are several west coast internet nurseries that carry some of the bananas. I have tried one of them and was very satisfied.
www.tropic.ca
The others primarily carry Musa Basjoo.
http://www.broadwaygardens.com
is located in southern Ontario and has a limited supply of banana varieties.
Allen