For those near Victoria, BC, Eco-sense is a good source of
perennial tubers. I bought oca and skirret from them this year. They have a list of what they have in stock at
Eco-sense.ca
I got red and white Sunchokes last year from Glenora Farm near Duncan,BC. They were selling them as food but they sprouted nicely in my garden.
Eventually we will have a perennial edibles nursery at our new place on Gabriola Island near Nanaimo but we are a year or two away from having plants to
sell. The only thing I think we have ready at this time might be
chestnut trees. I imported 400 grafted European x Japanese chestnuts (various named marron varieties) from Washington state back in the spring to establish a chestnut
polyculture orchard at the new farm. They are in big pots at the moment and some actually produced a handful of nuts this year which I wasn't expecting. By the time I noticed they were well along so I decided to just let them mature.