Halloween // Where to find cheap mannequins for a haunted house?

Hello! Does anyone have any good tips for finding a bulk of mannequins to use in a haunted house? I obviously don't want to shell out $80 for a brand-new mannequin that I'm just going to beat up anyway, so if anyone knows where to find them broken/well-used/imperfect I'd appreciate it. I've heard that Facebook Marketplace is a good place to start. I suppose I could always make them as well, but they probably wouldn't look as good. Thank you for any advice!