Like was mentioned, it was a Gamestop exclusive, so that right there greatly limited availability.
Second, it looks like according to Gamestop's website, they're out of stock, which I would assume unless there is going to be a reprinting (doubtful), they're not selling them anymore.
Anyway, as far as the game goes, I'm only about 14 hours in. Yes, I play with the CLASSIC controller. DEFINITELY better than playing with the Wii-mote.
As far as my thoughts on the game: It's very deep, great big wold, and excellent battle mechanics, but I'm yet to be hooked by the story or characters. Something about the Mechon, a bunch of robots, just fails to illicit any kind of reaction from me as far as villains go. And the protagonists, while not bad or annoying by any stretch (especially if you've played some recent Final Fantasies..ugh), aren't terribly memorable. I'm sure there's a big twist somewhere around hour 30, but as of now, probably about 1/3rd through the game, it hasn't hooked me.
Make no mistake, I like the game. It's enjoyable. But IMHO, it's gotten a little TOO hyped from a niche that is DESPERATE for a great JRPG, and are anxious to latch onto anything that might fit that bill.
I'll get back to it eventually, but right now I'm actually having more fun with a few other RPGs.