Charming independent musical ONCE has become the year's biggest U.S. box office success story - even though it has only made $1.7 million (GBP850,000) on limited release. The film, which was the toast of the Sundance Film Festival in January (07), was shot for just $170,000 (GBP85,000) in and around Dublin, Ireland. The musical love story stars The Frames singer Glen Hansard and his real-life girlfriend Marketa Irglova.