Bullet Proof out of Red Deer have some nice ones also (and some others that aren't great depending on your truck)
http://www.bulletproofbumpers.ca/chev_11.php
Yes - mine was fixed on the surface before Line-X, but rusted out from the back eventually. Once there was enough of a pin hole for water to get in from behind, the freeze / thaw cycles started pushing off the Line-X, which made the pocket larger and larger. Eventually had to poke holes in the...
I was quoted $7k just for re-doing the box-sides. $15k is probably accurate.
You can find cheaper, but I would be worried about quality. I would be choked if I did a bunch of work and it all started falling apart 3 years after putting in the effort.
Interesting to follow the Route from Blaeberry to Sask. Crossing on google earth and see how much of the route is already riddled with Cutlines, Forestry roads & Logging roads.