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Alibaba sells circular polycarbonate riot shields, unmarked, for $10-20 each. I am sharing this information for no particular reason.
Kinda want to fit one of these with some solar cells, a battery pack and some super-bright LED lights like the one on a phone camera. For reasons.
I considered the idea of fitting one with a fan for other reasons, but that seems like it would be rather more difficult.
Moved account, follow @lilov @InvaderXan pretty stuff. Shiny. The magpie council wants.
@InvaderXan LB/note: i would test that it's polycarbonate and not acrylic before using it, otherwise you could easily get hurt worse than without a shield easily. definitely test these before using them in a riot setting