I buy my fruit trees from Edible Landscaping with good results. They have a list of Asian pears (apple pears) and all are Zones 4 to 9.

Here is a link that might be useful: Edible Landscaping

Most garden centers have them.

Raintree Nursery is out your way and I have had excellent experiences with a variety of purchases---I love them!

Ann

Not sure if a U.S. source is acceptable to you, but my Asian pears came from Trees of Antiquity in California, and I've been very pleased. I'm in Zone 5/6.

Supposedly bloom time can be quite different depending on variety, so make sure you check out a pollination chart for compatibility.

Here is a link that might be useful: Trees of Antiquity - Asian Pears

I get nice Asian pears in zone 5, cold winters, late freezes, short growing season.

I don't know how they feel about rain, but cold doesn't seem to bother them.

If you can ship trees across the border, either Rain Tree or Burnt Ridge has Asian pears. Burnt Ridge has lower prices and cheaper shipping; expect their trees to be small.

I've purchased 4 Asian pears and they always seem to come without any roots at all, and then grow like weeds.

Sorry, I don't know any plant sources in Canada, but you might check the Garden Watchdog. They have a search feature where you can search for sources for various plants.