HII,
You can get the seeds from the nerest Horticultural research station or Department of Horticulture. Let me know from which place you are, so that i can give you the correct address.
If you are from tamil nadu, here are a few private addresses apart from the University of Agricultural sciences.
r.Selva Segaran.R.
AGROWIN FARM,
Oyster Mushroom, Mushroom Spawn producer, Mushroom Beds for Sale, 175-B, Trichy Road, Sulur – 641 402
2.Mr.T.C.Gunalan, DEE ,
DHARA MUSHROOM CENTRE,
Oyster Mushroom , Milky Mushroom and Spawn, Producer, LGM-2, Salem Camp, Mettur Anai –2, Salem
3.Mr.T.Rajendran, R.K.RamaJayam,
MADHURA MUSHROOMS & MADHURA FOOD PRODUCTS,
Milky and Oyster Mushroom Producer, Pickles Producer, 3/261 H, Thanga Nagar, Perambalur Road, Thuraiyur – 621 010
Regards
Ashwini