Looks can be deceiving! Joking aside, we ship to Canada.... a lot.
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EXCELLENT

do they come in a satin finish

Not this exact design... it comes in the polished nickel you see and a "bronze" finish.
We have others in satin nickel, of course. You may find one you like here: http://www.shadesoflight.com/lighting/bathroom-vanity/all-bathroom-vanity/
I added a few of my favorites (beware the last one that is the fresnel glass is actually an antique nickel , not satin Nickel.

Just incase your still looking for these, I just purchased these from Lowes in Edmonton during the summer, Calgary would have the same stock

I have a new 37" vanity, how large should my light be above it

More details here http://www.shadesoflight.com/inspired-spaces/tips-and-techniques/bath-light-solutions/
But as a general rule of thumb (and of course there are exceptions once you get down to specifics) I would be looking for bath lights that were 28" or larger

No, problems shipping to Canada! This is not an issue contact our customer service department for details visitor@shadesoflight.com or call 877.288.5029 (Mon.-Fri 10-5 EST)