Most of his books are published by Institute of Asian Studies, Madras, but as far as i know most of his books are out of print. Available only in libraries. But if you really want to read his books, I have scanned around 8-9 of his books. I can send you that.
Hi Vairam, deepest sympathies to the friends and families of the great scholar. Do you happen to have the two folk tales esp Mayil Ravanan kadhai scanned? I would very much like a copy.