Time Life has seller agents who come to your home and make a presentation to you on the books. If you then decide to buy them, the books will be reached to your home once your cheque clears. You cannot get them in stores. I am from Bangalore, so I got them from a local agent. I can provide you her number and she can possibly connect you to her colleagues in Delhi.
Let me know if you want the details and I will email them to you.