I use Pirate Ship to purchase the postage for all of my shipments. And they have an arrangement with Asendia will allow me to charge much less on International shipments (including Canada). Packages will still be delivered to you by your local Postal Service. The savings are pretty significant. Shipping time may be a little bit longer. I'm not sure. I won't know until I get some feedback.
New Lower International Shipping Rates
8trackavenue