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Springs are no problem because you don't need an export licence, Brownells or Wolff Springs or any number of other small companies in the US unless they're anal about shipping to Canada.
Or you could even buy them from R Nicholls. Let me know how you get on with that one...
I bought my SIG parts from Brownells. Just be sure to know what style parts you are ordering for. They don't do the best job when it comes to distinguishing the new style from the older style on their parts list. They are fast with shipping and there have been no issues with sending the parts up here and you may wan to get the SIG armourer DVD from them too it is a great thing to have when installing all of your new parts.