Supply Issue Completely Resolved Two weeks ago, all of these headsets were sold out at some time or another, for days at a time, yet now, even after huge price drops, they are ALL available, both inloine and at EVERY retail Store in the area (I used New York City as the are, since they seem to have the most local Microsoft Stores there).
As an aside, with Lenovo's recent price drop, one can now get a high-end VR headset AND controllers for $299.
https://www.microsoft.com/en-us/store/collections/vrandmixedrealityheadsets