Just did my first shipment from Canada to the US. Small light box.
Ground - $5 and change, no tracking, may take a couple weeks
Air - $7 and change, no tracking, may take a few weeks (postal clerk stated "should be a little quicker than ground but no promises"
Priority Air $16 and change!!! Tracking, insurance and will take a few days.
Apparently shipping from Canada is not so cheep either.
I was okay with the cost for the ground shipping but tripling for air with tracking? I also would have been okay with the small upgrade for air if there was a little more hope of a better transit time.