I have looked high and low for AT boots for myself for the last several months and can tell you that no one really stocks much of anything. Most mountaineering retailers will want to order boots for you from their suppliers, rather than buy various sizes as inventory and then be stuck with them (seems there is almost no market for AT gear in the states). I was in Bozeman briefly a few days ago and checked Northern Lights (Scarpas and Dynafits) and Barrell ( Garmont). Also checked Pipestone in Missoula (Scarpas). Three great shops, but nobody had my size. And forget about even finding a mountaineering retailer once you get away from the Rockies, Cascades or Sierras, or Vermont. (I confess, I have not checked Minnesota!) So, I am pretty much resigned to finding, fitting and buying my AT stuff long distance, via UPS. The good news is that most of these guys will agree to take stuff back from you if you don't like the boots when they arrive (though you will probably have to pay UPS charges).
Good luck and let me know if you find something.