@ bhavya and others in India: Rubik's 4x4 Revenge availbility in India
Very genuine problem. Even I tried a lot to buy them in India, but they are simply not imported. I even contacted all major suppliers, including Vcube (Germany).
However, they are available in India from last one month on eBay.in
Hint: Go first to idea.com and get a online recharge for your idea prepaid phone. They will offer you a 10% eBay discount coupon for that...