Here is a fellow member from India who bought some s9 mining units and had a nightmare.
I suggest you carefully read what said and make your calculations. Asking for prices locally would also be better. He says he needed an IEC as well. Just be prepared before paying anything.
https://bitcointalksearch.org/topic/buying-miners-from-bitmain-and-customs-duties-in-india-1805691
India has got very high taxes on all electronic items purchased from overseas and if customs come to know that your declared amount is not correct then they will simply hold on to the item until you contact them and pay the remaining tax amount. They want to encourage all made in India products so they are charging a very high taxes for these items. So you should be very careful before purchasing items from overseas from India.