Shipping Label Discounts

I just started printing my own Canada Post labels to take advantage of Ebay's great savings. Where do I find information about the discount program? Sold some magazines to the USA and got 50% off the postage, but sold a book to Canada and only got 20%. I sold the magazines on Ebay.com and the book on Ebay.ca. I would just like a little clarification on the program. Thanks! 

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It has always been more expensive to ship domestically than to export.

At a guess, Canada Post figures they don't have to pay for the "last mile" handling after the shipment crosses the border.
Or perhaps it's just  that USPS pricing is often lower than Canada Post, even allowing for currency exchange (now about 30%).

Check around for chitchatexpress or Stallion Express in your area.

They will carry your items across the border for a small charge, and ship with USPS. They also have domestic and overseas service now.

I have no personal experience, since they don't really service my area.