madhav, i would echo others' thoughts here. it is MUCH advisable to buy supplements in-person than indirectly (ie, online). you have much to explore there in the store than you could possibly do on the online portal. some better known (& good) brands for this are 'optimum nutrition or ON', 'british nutrition', 'dymatize', 'coach's formula', etc.
BUT (i understand you probably know all this, but still i would like to write), since you wrote that your work-timings are 'insane', i would strongly recommend you AGAINST using a whey supplement right now. no doubt that this supplement is processed from a natural food-product, but after all, its a SUPPLEMENT, and its meant to be taken (though not necessarily) if :
# you are really training HARD with weights (or other physical activity)
# getting good amount of rest (8 hrs sleep at night, and few 'rest-bouts' in the day)
# are eating sufficient amount of wholesome foods with good calories
but you already negated all this more-or-less when you wrote that your work-timings are not good, and i could imagine what could that mean. others have already written this thing above (aneelr and kittu). and if you are not putting in serious physical efforts, and may be are thinking to see some effect on yourself with this supplement, you will be disappointed. moreover, you COULD, get affected with painful fingers on your feet (i used to get these sometimes).
and if you like to train with weights and are a little-bit 'old-school tradition loving' type of guy like me

, then the best course would be to follow 'milk & squat'. nothing is more fulfilling than training for full body-power & strength & supplying your body with whole foods & nutrition, than training part-by-part continuously and busy in keeping a note of what supplements to take and when. hope you understand
anyway, since your original question remains somewhat unanswered, let me spoil you a bit. you could try this link, although i dont have any experience of it :
Shop Abroad on any U.S. websites from India, like Amazon, Walmart, Target and enjoy the lowest possible International shipping rates, fast delivery, hassle-free duty clearance and promotions!! Get a U.S. address, request or create your own quote.
(there's a banner for supplements here)
however, again, i wont recommend you ANY supplement in your present condition, more so because many people who catch on with supplements tend to forego eating wholesome foods and start depending more on supps. that doesnt give in training, what you could say as in my case, satisfaction
