[Begin flip response]
Locate a friendly marijuana smuggler from BC and pay him to drop your
package in the Canadian mail when he gets back home. You completely avoid
customs duties that way.
[End flip response]
For valuable things, we've always used Fedex. They employ their own
brokers and usually can get things through customs much faster than
ordinary mail. They also offer shipment tracking and will make good on an
insurance claim if the package doesn't reach its destination.
So, you may ask, "What of USPS insurance?"
We found out the hard way that USPS insurance (and delivery confirmation)
only covers a shipment until the moment it crosses the border. After that,
it's "contact Canada Post; we did our job".
Cheers,
Chuck