I originally purchased them in a 6pk on Amazon.ca, I don't believe they're available any longer. it was about $8-9 in a 6pk. I've also seen them at Michael's, but the price was around $10-11. I've gone to my local Michael's a couple times and I no longer see them there. When you ask the staff...
I think I saw the same ones at Niagara On the Lake outlet for like 39.99/49.99 just last week. Don't remember. At least something similar. I just remember the giant zipper was on it similar to the usual tech fleece pants.
you won't be charged at the door. Once you pay the import charges that have been listed already, that should be it. At least that's from my experience. I've ordered through it like 4-5 times.
Sometimes if seller is nice, you might be able to get them to just do paypal invoice w/ low value...