Nic through the border is risky. Technically, anything over 4mg is considered an unapproved drug. It might get bounced back - you might have to pay for shipping again if resent.
Gentlemen's Reserve has 1l or 100mg base for about $250 (yep - 5x the lowest price in the states), but it will get to you.
DIY Flavorless | DIY Center | Gentlemen's Reserve
Most other places in Canada only have 50mg as a max concentration.