Debra Cook of Denton, Texas, felt she scored a coup after booking her stay at the four-star Loews Philadelphia Hotel for $100 a night Sunday through Thursday last week, on Priceline.com. "You can't beat that rate," said the 11th-grade English teacher, who was here for a five-day conference at the National Constitution Center. But Cook's room savings are costing city hoteliers. While downtown hotels are benefiting from new business brought by the recently expanded Pennsylvania Convention Center, they are charging rates far below 2007 levels because of the sputtering economy and intense competition from other major U.S. cities, primarily New York, Washington and Boston. Get the full story at philly.com