I've had 50/50 luck with shipping to Canada. Some say yes and done say no
It's a bit of a hassle because depending on the post office you have to have a customs form filled out in pen prior to entering the post office. One lady was sent away because her writing wasn't legible apparently.
Also another way they ship is to have pick up at their house, which to Canada costs a boatload, but cheaper for us if they go to the PO, more inconvenient for the shipper.
And yeah, it does cost more.
You can always see if the item will fit in an oversized letter mail.