For Canadian readers....After reading this, some quilt friends and I ordered a couple from Pleasant Ridge Saddlery. One of the quilters has picked them up and later in the month I'll get them from her and cut them for us to share..
https://www.pleasantridge.ca/index.php/pad-liner.html
They seem to be the same product, but theirs are tan in colour. I'm not sure what shipping would be, we were able to pick them up as they're close by.