Randy Roberts is a bohemian's bohemian, so it's surprising to some that he's also clearly an art connoisseur. A couple of years ago, he added Z Art Department to his mini-modernist shopping center on Speer Boulevard that also includes Zeitgeist and Z Modern, shops devoted to vintage and contemporary design, respectively. As can be inferred by its name, Z Art Department sells art — but the name doesn't hint at the broad range of Colorado artists you can find here. The gallery has devoted solos to Al Wynne, Herbert Bayer, Dale Chisman, Edward Marecak, Roland Detre, Winter Prather and others. And while shows at places like the Kirkland feature works that have already been snatched up by somebody else, at Z Art Department you can still snag some masterpieces for yourself.