 A couple of high-end shopping giants are struggling. The parent company of Saks Fifth Avenue plans to buy rival Neiman Marcus. The deal is worth $2.65 billion. The new organization would be called Saks Global. It will be made up of Saks Fifth Avenue and Saks Off Fifth brands, Neiman Marcus and Bergdorf Goodman, as well as the real estate assets of Neiman Marcus Group and HBC,