Have you visited Toys R'Us at Jack Mall? That mall is a small commercial complex located at the back of Queen's Square at Minato Mirai in Yokohama. If you don't pass via the Minato Mirai Line, most likely you can take the Sakuragicho station. Been there 4 years ago so my info may not be that accurate so be warned.

Btw, you gotta love autumn in japan!