Fans of the Radius burger have reason to rejoice this month. Chef and restaurateur Michael Schlow is offering his award-winning sandwich to bar and lounge diners for half of its regular price every Saturday night until the end of the month. That means the burger, awarded top honors at the South Beach Wine & Food Festival back in 2008 and more recently commended by Boston Magazine and Epicurious.com, can be yours for just $9.50. Swing by High Street to see what all the fuss is about. Call Radius at 617.426.1234 for details or directions.