I have a fantastic relationship with my not-so-local bike shop (NSLBS). I deal with a LBS in Colorado and I've asked him for information on the Big Dummy for a while. A month or so ago I gave him the heads up that Surly stated they were out of the factory.
Today I got an email telling me that the QBS inventory now shows Big Dummy inventory. They are going fast, though. He was amazed, too. When he sent me the email telling me that he saw the inventory, there were 50. When he got my email confirming that I wanted it he told me there were 18 left in inventory. I don't know if that was for my size or for all sizes but he was pretty shocked.
My 2-cents on the BB7. These are great mechanical disc brakes. I have them on my Kona hard tail and they served me well for XC riding using 160mm discs. I moved onto a full suspension bike last year and decided to use the Kona as the donor bike for my Big Dummy.
That means the BB7 brakes are going on.