Comic enthusiast Dan Burges has opened Excalibur Comics at 7402 20th Avenue, specializing in graphic novels, collectibles, toys, and specialty hand-made items like the Super Mario Bros question mark block coin banks [http://www.etsy.com/listing/92178707/new-super-mario-bros-style-question-mark?ref=pr_shop] by Burges’s girlfriend, Emily Shea [http://www.