Spirit Halloween should have had random film-related 'rarities' inexplicably appear in dumpster bins during the film's pre-production period, without any of that crap appearing in the stores themselves.
Dumpster diving is more integral to SH than Spencer's cares to admit.
If it was realistic, they would only have to fear half the store space and in the vast, empty back half make due with makeshift weapons left in the forgotten boxes left behind by Staples or whatever empty store front Spirit moved into.