So after reaching out to a half a dozen dealerships in Canada... a parts guy at Toronto Kia was able to order one of these for me & ship to Illinois. Pricing was $275 CAD for the liner, (an obscene) $300 CAD for FedEx shipping & about $75 CAD for tax. All in all it worked out to about $510 USD after factoring in the exchange rate.
Certainly not an economical choice--but given that there's really nothing else like this on the market--and because have one carseat installed in the back row--the back row ends up halfway folded down most of the time--so having some all-weather protection combined with the ability to fold down part of that 60/40 back row made the high cost of shipping worth it for me.
But--yeah--$300CAD to ship is crazy (the item arrived in 2 business days). If the border wasn't closed for COVID, I would have been tempted to make a weekend trip up to Detroit/Windsor to cross the border & pick one up in person.
As for the liner itself--it's pretty nice. It's a bit softer than what I expected (i.e., it's softer than
Smartliner,
Weathertech products, etc.). It's almost feels like a blend of foam and rubber--think halfway between a rubber basketball & a nerf ball--but it doesn't seem so soft that it would tear easily. The back of the liner has a rough rubber/fabriclike feel to it (akin to the back of a normal carpeted floor mat). It came folded over in a 2' x 4' x 4" box--which left a crease mark in the middle of the liner (hopefully it evens out eventually).
The back has a few velcro tabs on it--which velcro the edges of the liner to the carpet on the back of the seats & in the flat cargo area. The velcro seems pretty light duty & not too sticky--so it doesn't feel like it's going to do much damage to the carpet on the seats/cargo area. It also has straps that loop around the headrests in the 3rd row to keep it in place. Fit is pretty good--but It doesn't quite lay flat when folded down--as there's some extra material in the transition crease between the seatback & the flat cargo area (you can see in the pictures that a few inches of material folds up accordion-style when the seats are in the up position).
So--all in all--I'm pretty happy. Not cheap, but it's what I wanted & I feel like it's good protection for my new Telly.
Kind of crazy that nobody makes these for the U.S. market--seems like there'd be plenty of demand for it.