Several shops in Mount Gambier's economic heart stand empty as rising costs and changing shopping habits take a toll. newsiviewlistenLoading ABC NewsNews HomeRising costs and online shopping hurt Mount Gambier's historic Commercial StreetShareShare articleRising costs and online shopping hurt Mount Gambier's historic Commercial StreetBy Sam Bradbrook. Kathy Gandolfi says there have been some tough periods for Mount Gambier businesses. (ABC South East SA: Sam Bradbrook).