SAN FRANCISCO (Reuters) - Alibaba Group Holding Ltd [IPO-BABA.N] is prepared to raise the price range on its initial public offering to $66 to $68 a share, from $60 to $66 previously, The Wall Street Journal reported on Monday, citing people familiar with the matter. Alibaba's executives are currently touring several major cities on the company's global roadshow. Sources say demand for the IPO, which could be the world's largest, has been strong. (Reporting by San Francisco newsroom; Editing by Leslie Adler)