In or from mainland China? No. I converse with native Cantonese speakers from Gwong Dung on a regular basis, and they have told me that teaching materials were not available on the mainland. I am either misinformed, or the situation with textbooks has vastly improved in recent years.

I have had no problem buying Cantonese teaching materials, including the Robert Bauer's comprehensive Cantonese dictionary, Victoria Yip's Cantonese grammar book and a quite a few more obscure ones from Western online book sellers.

Why was this downvoted? It makes no sense. I am not an apologist for CCP but this is a terrific retort!