St. Georges is actually supposed to be the first good American absinthe. I've never tried it myself. Since it's made in US, you should be able to get it somewhere in Canada. Or just hop the border and grab some down there.
Before you buy
anything check out the
Fee Verte buyers guide. I've been going to that since for like 10 years, and in fact have contributed some reviews.
I wouldn't recommend buying anything without consulting with those guys first. They know all about absinthe, so believe them.
You can buy a lot of good (and bad) absinthe
here. I use them exclusively. I can guarantee that 999 times out of 1000, if you buy a bottle of absinthe in a liquor store in Canada, US, UK, Most Of Europe, wherever, it's going to be garbage.