KSA has more support then most of the small time grading companies, but personally I would avoid their cards. Unless I had the card in hand and the holder allows me to see the edges.
. PSA and SGC both have Canadian drop off locations, at least they did the last I heard. I believe Lem Pottie (SP?) does this for PSA and Larry Kerrigan does it for SGC. Again these arrangements may have changed but i know they were both in place a few years ago.