Anywhere in Tokyo to buy Arashiyama mascot plush?

Hi all, returning to Tokyo tonight from a day trip to arashiyama and fell in love with their weird mascot Tsukihashi Wataru. A lot of the shops there had a plush version on display, but none of them had any for sale. Is there anywhere in Tokyo that sells goods from Kyoto + surrounding areas or specializes in mascot merch where I might be able to find this?

by code__cat