Co Purchasing OSAP Common Purchase Platform It creates cost advantage in purchase by combining forces of its members and provides competitiveness in domestic and foreign markets with its sales organisation. With basis set up in 2002, it was established in 2007 and then became incorporated in 2008. Today, it is making purchase on behalf of one thousand private sector companies and seventeen thousand members of İTKİB. Revolutionary! OSAP is a revolutionary project in Turkey that makes common purchases and sales of firms as a professional and wide based purchase and sale platform. Trust OSAP membership is free of charge; membership agreement doesn't consist any recompense or liability. OSAP doesn't share information of firms with other firms in any case.