If amazon does not have an Indian store, or ship stuff to India from one of it's other stores (possibly from the EU), then your best option would be to pay someone somewhere else to buy it & have it shipped to their address, then send it to you.... assuming of course that:
A) You only want to buy them for personal use, and
B) There are no legal/customs/import restrictions on sending the tablets to your address, and
C) You're not trying to get a big number of them shipped to you so you can resell them, which would be illegal, regardless of where the shipment originates from....