Hello Paul
Its the brokerage fees and taxes that will up your shipping costs quite a bit when using couriers. Try to get small items mailed when possible. Like Kevinski said, I use an outlet in Port Huron to pick up packages.
I find trying to find parts on this side of the boarder to be a painful experience. I just bought shocks from the US for my 57 Olds for $22 each when Carquest wanted $49 each. Most times the guy behind the counter has no way of looking up the part let alone get it.
Good luck with your build.

Mark


1952 GMC 9430 one ton pickup, a work in progress

1952 1-ton pictures on Photobucket