Yikes! Definitely one of those cases where being in Canada is not an advantage. I know that NZ and AU also pay terrific prices. We all have our trade offs, I guess.
How far into Ontario are you? I'm in the Finger Lakes - about 2 hours to the Niagara Falls bridge. So lucky to have a couple of Mennonite stores nearby. One has a smaller selection, but has Moda and Timeless Treasures wideback for about $12/yard. The other has a larger selection of standard yardage, starting at about $9.50/yd.
I don't worry overly about my backings. Something in the same color family, or theme, works for me. It wasn't that long ago that most quilts were done with muslin backing. I'll also piece backings - more than just a single seam - to make large ones. Gets me a backing and big pieces out of my stash, so it's a win/win!