North America's largest family footwear retailer, Payless ShoeSource Inc, has posted flat August same-store sales but said total sales climbed almost two per cent to $240.1 million from $235.8m in 2001. The Kansas-based operator of nearly 5,000 stores said total sales for the first seven months of fiscal 2002 slipped 3.1 per cent to $1.75 billion from $1.81bn last year, with same-store sales down 5.3 per cent.