Looks like Scala has a special mailer. See it here. Not many places in North America process it so it's probably the best bet. Another option is the DR5 process. Not having done it myself I can't really recommend it, but looks interesting. Here's their website.

I've used the Kodak mailers before, and it took 2-3 weeks total. That's been a few years, but the amount of time it takes probably hasn't changed. Not sure either about shipping to Canada though.