[Ibby]

Simple solution, if you live close enough to the border. Get a post office box on the US side. You might be able to get one in an actual postal outlet, or you can easily get one at a place like Mail Boxes Etc. I've got one in NY state, and another in Washington state, and they have been a godsend when trying to get parts for my Jeep, airoft guns, various electronic stuff, etc. Just make sure you claim all your items when you cross the border and you're set. At the same time you can also become your own broker to get bigger items through customs. I did this when I orderd a new engine for my Jeep out of the US last year, and it saved me a ton of cash. It's well worth the time it takes to fill out the paperwork.
Another route to go is to use a company that will bring stuff across for you. In Seattle there's a company called Sea Wings that you can have your items shipped to, and for a small fee they'll bring them over on the ferry to Victoria for you to pick up. It's a pretty kickass service, and they'll handle large items as well.