its included in the price on checkout (u can perform a checkout process to see what shipping will be)
there are brokerage fees & duties & taxes calculated in the price for you so there won't be any surprises @ the door
for example:
this shirt
http://www.mrporter.com/product/166348
is selling for $113 now to have it shipped to Canada after all the fees it ends up being $170.48
they have a flat shipping rate of $20 if you're in the states, $22.40 for Canada, so that's $35.08 in taxes duties and brokerage