Kool Skool is a fantastic site to get books and graphic novels. It's got a wide selection of books grouped by different age ranges and also some graphic novels from the DC Comics catalogue. Originally a bookstore in Gurgaon, they've taken their selection online and are shipping straight to your home. I got myself a Hitler manga by Shigeru Mizuki, a Japanese manga artist and historian, who creates graphic novels with great depth, wit and humanity in them. Some other recommendations - Watchmen, The New Kid, The Killing Joke (Batman), and of course classics like Tintin and Asterix. They also have Amar Chitra Katha comics!