I'm also making an assumption that Toyota is behind the curve, it could just be a temporary situation because of a demand spike. I am on the list from Helm when they come back in stock and so the list may just be growing until they get enough on it to do a print run. Toyota is all about just in time, so no sense printing a bunch of 2-inch thick manuals that will just sit on the shelf for 5 years. My guess is most dealerships have the manuals as electronic files and it's just knuckleheads who still want printed manuals.
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war, let it begin here." -- Capt. John Parker