I want to ask where I can buy a traditional Japanese toy-wooden ball.

That's a sword ball. The wooden ball should be surrounded by a tray, and there is a cone around the tray, and finally it reaches the sharp top, commonly known as the world around it.

This toy 100 yen is very cheap, which is available in shops, and it is about RMB 6.6, but the freight to China will not be cheap. Moreover, this toy is made in China and should be available in China.