I have a good friend from the Air Force who is married to a wonderful Canadian gal. After posting a photo of one of my American Flags on Facebook, there was some sort of off-hand remark made by this wonderful Canadian along the lines of "if it were a Canadian flag, we'd order one".
I accepted the challenge and just mailed them their American Flag, Canadian Flag and a roundel. They got the full package!
I think they may have noticed that the American flag is just SLIGHTLY larger than the Canadian flag.