where can i get audio stories of tizan in english for children

If you're referring to Lo Rwa èk Ti Zan : Somin la mèr or similar books, then I don't think they have an English version. This book has been written in Creole (Reunion Island Creole) and I doubt they have it in audio format.

You may however go to one of the big bookstores (eg Le Cygne, Editions Le Printemps, Antarra) to enquire. Otherwise you can get in touch directly with the publisher itself : www.ille-sur-tet.com