I have been getting some from this nursery, klick below.

Konrad

Here is a link that might be useful: Nursery

There is also the other Boughen Nurseries which is not affiliated with the one above.
These guys are located in Manitoba.

Here is a link that might be useful: Boughen Nurseries

I order seeds from T+T seeds in Manitoba they also sell plants and trees--fruit and others. Their prices are quite reasonable and I've always been very satisfied with anything I got from them. Thry have a website if you want to check them out

Since I'm in Alaska, I think I might have a problem with ordering from Canadian nurseries. I found the one I was thinking of but couldn't remember - St Lawrence in NY. thanks!