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- Patent pool
The AR market is not just entertainment, Microsoft has been failing to build a viable AR helmet for soldiers for years now, after the latest-and-greatest fight jets got them.
Professional use too - think of how much simpler and safer ‘realistic’ training could be for deep sea commercial divers or oil rig workers. Live schematic overlays for aircraft technicians at work/in training.
Those are a few of the applications where an absurdly high unit cost/license fee would be gladly swallowed instead by governments or business.
Basically any military surplus store really. Online stores all tend to have very aligned pricing so but you cannot inspect the (used) item for issues, sizing, stains or damage, etc so I’d recommend finding your local military surplus store - just recognize that you’re thrifting not shopping. Not everything is available, nor worth having necessarily, and it’s commonly been worked hard and not cared for before it found its way to the shelf.
If you want to roll the dice and get some serious deals, there’s usually a liquidator or auction website for your local PD and/or government to offload their outdated but workable gear and tech. But they usually have very particular rules around shipping and pickup, you arrange all that on your own.