When I ordered mine I was in the middle of buying some parts off of placelast on the board here, and he was kind enough to let me ship them to his place and he shipped them to me.
But what I've fouind is most places will use UPS to ship to canada, and they rape you for brokerage fees. So in order to avoid these fee's, I only buy from companies that will use USPS, as they and Canada post have a flat rate $5 brokerage fee deal.
http://www.onoffroad.com/Merchant2/merchant.mvc?Screen=SFNT This is the ONLY company I have found that will ship via USPS to Canada, they use UPS in the states, but go through USPS for Canadian orders. I can't rememer what the shipping for my tires were, but I got 2 dunlops for $150can shipped w/ some other stuff that I purchased. Which is cheaper than $121 a tire anywhere else in our town.