Three independent supermarket chains are deploying a custom solution for digital grocery retailing. Harmons Grocery, Rosauers Supermarkets and Sprouts Farmers Market are all rolling out or upgrading to Instacart Storefront Pro. Utah-based upscale supermarket chain Harmons Grocery and Northwest grocer Rossauers Supermarkets are implementing Storefront Pro for the first time, while fresh, natural and organic foods grocer Sprouts Farmers Markets is upgrading to the latest version.