Many camera shops in Chennai sell binoculars. If they are not in stock, the shopkeeper can usually make arrangements to get them for you. One such shop is Shetala Cameras, at Spencer Plaza.
The best way to get binoculars is to ask a friend or relative to get them from abroad. The Internet is a vast resource. You can search, compare features, read reviews of all types of binoculars from the Net. You can then decide which one to get.
A disadvantage in buying through someone else is that you cannot try out the binos. They may be too heavy for you, or you might not find them handy. Make sure you read reviews before deciding.
Good brands of binoculars include Nikon, Olympus and Bushnell. The top class brands like Zeiss and Leica are masterpieces of optics.
Binoculars having specifications of 8x40 or 8x42 are good for beginning birdwatchers. Consider paying a little more for waterproof and nitrogen filled models, as these will last much longer.
Googling for buying binoculars will give you access lots of websites dealing with binoculars.