Full-contact combat (Buhurt/SCA), museum-quality collections, and high-fidelity reenactment [2, 3]. Where to buy:
Live Action Role Play (LARP), theater, and cosplay. Where to buy: where to buy armour
For "real" medieval armor, you aren't buying off a shelf; you're commissioning a craft. Full-contact combat (Buhurt/SCA)