Brooklyn Superhero Supply Co.

From the website: 826NYC is located behind a secret door inside the Brooklyn Superhero Supply Co, a real and actual retail store where you can purchase books by our young authors, superhero costumes and accessories, and locally sourced Antimatter, Chutzpah, Omnipotence, and Pride. All purchases at the Brooklyn Superhero Supply Co directly support 826NYC’s creative writing programs.

Dave Eggers is one of the founders and there are multiple locations with different themes around the country!