Have you tried contacting a local Dahlia club? I knew a couple who belonged to the Quebec Dahila Society and they had amazing specimens growing in their garden.

Below is a link to a listing of societies in Canada and U.S.A.

Here is a link that might be useful: American Dahlia Society

You need to find jroot who hangs out on this forum sometimes and also on the Dahlia forum. He grows many many dahlias and has some photos posted on there right now.

There was a retailer in B.C. now I don't remember the name. Did see their gardens in the fall a few years ago They have acres of dahlia plants
And have a catalogue

We do have a Dahlia and Chrysanthemum society here in Ontario as well

Ferncliff Gardens in B.C. has an online catalog (Dahlias, Peonies, Iris and Daylilies).

And... Swan Island Dahlias. in the states will ship to Canada but you have to pay extra for an agriculture inspection certificate.

Aftermidnight Thanks yes that is what I was thinking, Ferncliff Gardens and i know Swan Island Dahlias are great as well.

Would not mind if I where walking the fields of Ferncliff Gardens, right now.
Love B.C. and miss it more and more as I become older.
Used to live in Kelowna, which although not Vancouver Island,is pretty nice and the weather perhaps in ways better.e

Back in September, I posted a message asking anyone could help me locate a few heirloom dahlias. Someone responded very recently with some helpful info but unfortunately (out of frustration), I ended up ordering this particular dahlia from Jan's Country Garden in the U.S. A truly fabulous lady and gardener who is extremely passionate about her business. I'm sure I will be very happy with my tubers when they arrive in the Spring (she guarantees it!).She had many dahlia cultivars that I have had difficulty finding and so, included them in my order as well. I can't wait for Spring!

Your local Canadian, Provincial Dahlia Societies will no doubt be able to help you with your requests; they are usually up on everything having to do with the plant in question.
They guard their responsibilities about what they are all about; it wouldn't do to fail a dahlia grower.