The lowest price advertisement from subhiksha seems to have generated quite a lot of interest amongst users. However locating a subhiksha mobile store seems to be quite difficult especially as the website of subhiksha is under construction. Hence the best bet to locate a subhiksha store in India is to send a sms to 56161 with the text bachat (Please note the space etween bachat and pincode).
I have tried it for mumbai. If you try this method then do let me know the result in the comments.