Ask fashion queens where to buy a handbag and you’ll find yourself on Wilshire Boulevard between Roxbury and Camden. Neiman Marcus carries 30-plus designer lines and has a whopping seven in-store boutiques devoted to the likes of Prada and Tod’s. But Barneys New York shines even brighter, carrying more than 40 lines, from smaller independent labels such as Gryson (for the Bel-Air set), Kale (structured bags in bright colors), and Bing Bang (perforated leather) to heavy hitters like Fendi and Marc Jacobs. “Must” bags notwithstanding, it’s possible to make a handbag purchase for a couple hundred here.