https://gcsurplus.ca/ also know as a Government of Canada Surplus, sells respirators at a cost of 1 CAD per box (which contain 50 respirators)
they will ship (only to canadian addresses) free.
Heads up that last time this was posted, someone noted that part of the reason they're dumping these is (probably) because they're close to expiring.
E: This probably only means that the elastics are wearing out.
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