When it was under warranty, I tried phoning Canon Canada to get my powershot repaired.
I was told in no uncertain terms that because it was a US camera, it could only be served by Canon US...
Canon US told me that it had to be shipped from a US address and back to a US address.
This was a few years ago...
Of course, once it was out of warranty, I shipped it to Canon Canada without a receipt, and they repaired it via goodwill....
Canon US and Canon Canada are different profit centers and different legal entities.. If Canon Canada fixes your US camera, it costs them money they wouldn't normally need to spend. That being said, sometimes you can get lucky - and worse case scenario, you can use a forwarding service to get your camera fixed - since you're saving a couple hundred buying it...