DEERFIELD, ILL. — Despite slower sales in the just ended fourth quarter, Cosi, Inc. said sales for the full year ended Dec. 29 rose. Sales during fiscal 2008 climbed 0.8% to $135,579,100 from $134,556,300. During the fourth quarter, meanwhile, sales decreased 7.3% to $30,734,700 from $33,519,500. "In this very challenging economic environment we remain focused on working collaboratively with our company and franchise partners to drive revenue growth and operating margin improvements while providing each and every guest a great experience," said James Hyatt, president and chief executive officer.