Nintendo of Japan has opened its first online store allowing Japanese consumers to purchase an array of accessories for a different range of Nintendo system. Japanese consumers can purchase Wii, 3DS and DS items along with accessories for the Gamecube and Gameboy Advance. The store also includes things that can’t be purchased at traditional retailers, such as instruction manuals and replacement parts. Nintendo of America and Nintendo Europe haven’t announced anything to suggest that they’re planning to offer a similar service.
Edit: Nintendo of America do have an online store. Thanks B0b_2012.