Like others have posted, it's available here in Illinois. That being said.....
ATTN: THREAD DRIFT! THREAD DRIFT! 
Like I have stated before in another thread (threads), I've heard from a couple of different sources that Weller 12 is supposedly becoming a once a year release like the BTAC and Van Winkle bottlings. Not sure if it's true or not, but it sure seems that way. Stocks in my general area tend to dwindle a bit, then just when you think it may disappear, voila!, shelves are somewhat full again. I'm gonna go out on a limb here with a word I hate to use, I am
assuming that this is a direct result of the BT wheated distillate being used entirely for the Van Winkle bottlings now. Dohhhhh! Ya' reckon?
FWIW, I love Weller 12. A 12 year old bourbon that tastes pretty darn good, and is available at under $30 is, or should be a bargain in anyones book. But that's just my opinion.

I also would never use it for the SB blend. It stands alone as a great bourbon in and by itself. I use Weller SR and OWA for my SB blend. Just makes more sense to me.