Where can I buy songbooks and scripts in Lei Ju, or where can I read them online?

Lei Ju is a local cultural and artistic treasure in Leizhou and a wonderful flower of traditional culture in western Guangdong. Lei Ju originated in Leizhou City, Guangdong Province (formerly Haikang County) and is widely spread in Leizhou Peninsula and Leizhou dialect area. It has a history of more than 500 years, and has experienced the development of exhortation songs, song-based classes, large classes and Lei Ju. Lei Ju often performs in Leizhou, Suixi, Xuwen, Lianjiang, Dianbai and Zhanjiang suburbs. With many characters, wide scenes and rich contents, it is deeply loved by the masses and has become one of the four major operas in Guangdong. In 2009, Lei Ju became the third batch of Guangdong Intangible Cultural Heritage List. But Lei Ju's songbook is very rare! !