Fresh Wasabi Root & Wasabi Grater

Does anyone have store suggestion where fresh wasabi root and the grater can be purchased in Taipei, especially in Ximending area? Thank you!

I’ve seen wasabi root once in a while at the higher-end supermarkets: Jason’s, City Super, Breeze Center.

Is there a special kind of grater for wasabi? I’ve just used a ceramic grater like this; I think I bought it in Taiwan, maybe City Super (also try Crate & Barrel), but I can’t be sure: