You international guys need to buddy up with someone so you get all your shipments as gifts, not duty. It works have done it in the past with no issues. Shipments between individual persons not companies does not raise eyebrows.
Here is an example to test the theory of sending packages from individual's (not specifically as gifts, that is a whole different equation to be looked at):
I received three packages this week. One was from Midlife, addressed from his personal address (as far as I can tell). He sent it USPS, declared the contents as "electrical auto wiring" with a value of $100. Result: No duties paid on my end upon receipt.
The second was from an individual in Cochranton, PA. He declared the contents as "front motor cover" and a value of $125. Result: $31.22 in duties paid.
The third example: An auction site purchase of hub caps (not a happy camper at the moment on this purchase...) from Arkansas and this site uses supposedly a third party shipping and duty collecting service. End result: $26 in import charges. Note: When ever you use this auction site, and are from outside the USA, you are forced to deal with their collection/mailing service, absolute rip-off...
So, for some reason, Midlife's package was not screened by Canada Customs requiring the applicable duty to be paid upon delivery. The package from the second example above was similar size, value etc. Paid the duty...
The last example is a last resort purchase for me at any time, without getting into the specifics. Upon receipt, the hub caps were not "NOS with a few shelf wear scratches and appear to have never been on a car" as described. One had a substantial dent, and another had curb rash... Now I am disputing the sale and looking to return these and get my $$ back... Why cant sellers be upfront and honest, save everyone a lot of hassle...
Conclusion: Its hit and miss with packages coming into Canada, my experience has been to always try and have the item shipped through USPS = 50/50 chance of being asked to pay duty.