Effohh
Bose X headsets are sold at one price worlwide 995 US. Bose dealerships are based on this selling price so you won't find any 'bargains'.
I bought one from Pacific Coast Avionics at Lakeland while in Tampa last month. Any dealer will send to your US address for pickup after ordering on line or telephone.
If you pop it in your suitcase with your personal gear you save UK vat and duty, not that I did of course!!