I'm seeing the same thing with 4Runners - either "on order" or "in build phase" or some other thing other than on the lot, and the local dealer never has more than 4-5 available (again, not on the lot).
My 4Runner only has 75k on it now, so I could easily drive it for another 75-100k. The only reason I'm looking is that either next year or the year after, they are killing off the 5th gen 4Runners and coming out with gen6. Everyone is excited about that, because it will be a new, smaller turbocharged engine, 1428 speed transmission, and all the latest toyo electronics in the cab.
However, the 5th gen engine and tranny combo is probably the most bulletproof that Toyota has ever produced. They just go and there are just very few problems over like a 12 year history. People say the engine is anemic compared to current stuff, and sure, my F150 Ecoboost leaves the 4Runner at the starting line, but I've found the engine has more than enough power for me. So the idea was to trade mine in for the last of the 5th gens and kinda "reset the clock", giving me a good 15 or more years with a bulletproof platform that I like.