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The zombies are coming. Are you ready?

Americans en masse have been getting ready for the undead epidemic since it went mainstream with AMC's hot series "The Walking Dead," which returns for its fourth season on Sunday.

Zombies aren't real. But the army of savvy entrepreneurs catering to their fans and fanatics are making some very real money, peddling enough zombie-branded survival gear and paraphernalia to form an industry unto itself.

October 15 2013 02:09 PM ET