International shipping question.

I'm in the U.S. and have a buyer for something I put up for sale who is from canada, and since I have maybe only ever shipped internationally a couple times, last time being well over 10 years ago, I do not know how to find a reasonable quote when I use shipping calculators on usps, ups, and fed-ex. All I want to ship is a tank cover and it could easily fit in a bubble envelope, but Im having bad luck with those calculators and keep getting quotes from around $26-$80 wen I try to describe the package's description.

Can someone with experience in this regard help me with some advise, and lmk if I should be getting a price far cheaper than what I mentioned for just shipping out a 68/45 tank cover? Thanks :-)