I was told by one of the S/A's at Barneys, that they will only send a B-Bag to the outlet if it's DAMAGED (they showed me one that they were sending and it was SERIOUSLY damaged!!). The S/A told me that they are prohibited from selling the "Motorcycle" style bags at the outlet.
As far as Saks "Off 5th", I've NEVER seen a B-Bag there. Remember, not all of the Saks branches even carry B-Bags (for instance, the one here in Boston doesn't because Barneys/Copley carries them).
I've only been to Neiman's Last Call once, and I was TOTALLY unimpressed by the accessories that they had and overall, the merchandise looked very picked over.
Alas, the "outlet" stores here in the US don't measure up to those in Europe ... UNFORTUNATELY!