Where can I buy Beyblades in Tokyo?

Hi, I'm a newbie & hope I'm posting my question in the right area?
My 2 boys looooove Beyblades, they are 4,8 yo. I will be visiting Tokyo 6-10 January and wondering if you can let me know the best shop(s) to buy some Beyblades & Launchers for them? I'm staying in Shinjuku. 
We live in Melbourne, Australia. TIA
Hey, I will arrive in Tokyo right after you actually hahah.

Somebody else asked a very similar question before, so you should try to find their thread about it. Generally, there are only two Toys 'R' Us in Tokyo, so other than that, try stores like Yodobashi Camera and BicCamera.