I believe that Kawasaki is still importing KX125's and KX250's to Canada and if you want a brand new one, you can buy one there and then bring it here. For a rider of AC's caliber, his bike is probably completely built by pro circuit and most of it wouldn't be stock anyway, so they could start with a used one and rebuild it for him. If you want a brand new KX 2 stroke, look up Canada Kawasaki website and see if they are still there.
I checked with both Kawasaki and Suzuki Canada and it seems that they are no longer bringing in 125's or 250's in 2 strokes anymore for 2012.