Try posting on the Canadian Gardening Exchange. You might get some from BC. It's not hardy enough to survive the winter anywhere else in Canada.

They are not the cheapest nursery around but they carry Crape myrtle. Some nurseries may be able to special order for you. Here's a Crape myrtle on Saltspring Island by a building. May was too early for it to flower. It's more of a mid to late summer blossomer. Maybe Ray at Tropic.ca in Delta (BC) can help you if you check his site and e-mail him. He can ship to you.

Good luck

Here is a link that might be useful: {{gwi:538717}}