If you happened to watch the BBC version of Top gear last week, one of the guys made the comment that the cars are produced on a 9 to 1 ratio so that for every 9 Toyota/Scion built, one BRZ is produced. Not sure this has been confirmed 100% but that would also make them a longer wait.
If someone can find you one in the color and options you want and it's below sticker, I'd jump on it.