• "KPop Demon Hunters" is a Netflix hit — and also a super-popular Halloween costume. But where to find one? • Spirit Halloween makes the officially licensed version, but only in limited quantities. It's sold out. • Netflix tells Business Insider that interest from licensing partners was "soft" before the franchise became a runaway hit.

Like the parents of many 7-year-old girls, Natasha Marks had a big Halloween problem. Her daughter wanted to be Mira, the red-haired, blade-wielding heroine of "KPop Demon Hunters."

The Mira costume was sold out online, but Spirit Halloween's website said it was available at the store near Marks in Manassas, Virginia. She drove over, even though she knew she might be too late.

"I knew it was likely sold out because I've been seeing tons of people on

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