Pittsburgh-based SupervaluGiant Eagle retailers have joined Campbell Soup Co.'s electronic school rewards program. The two, plus Kroger, ShopRite, Price Chopper and Safeway, are participating in Campbell's E-Labels for Education, which electronically awards points for qualifying products purchases. Points can be redeemed for school items like books, microscopes, musical instruments and athletic equipment. To participate, shoppers enter their loyalty card number and designated school at elabelsforeducation.com. Each time a participating item is purchased, the school automatically receives points.