I take a little bit of issue with that thread. Everyone always likes to call out how shipping to Canada IS NOT MUCH MORE, yet the same flat rate box is $32 to Canada vs. $10 to the US. 3 times the cost is pretty significant, no? And I know, that's a Priority box, but often that winds up being cheaper than doing non-Priority in your own packaging.
...now if you'll excuse me I'm off to ship a high-end marker to Canada