Where to buy oshizushihako box in Tokyo?

Hi, I will be traveling to Tokyo soon and wondering where to buy oshizushihako, the wooden pressed sushi box?
Anyone pls help!
Thanks!

I think you can buy Oshizushi bento box at "Matsuri bento shop" innner section, central stree of JR Tokyo Station.
http://www.nre.co.jp/ekiben/tabid/231/stoid/609/brnid/66/Default.aspx

or, Daimaru Department store Tokyo, B1 food court.
http://www.daimaru.co.jp.e.md.hp.transer.com/tokyo/index.html

Go to "Kappabashi" near Asakusa.
http://www.kappabashi.or.jp/en/index.html
https://youtu.be/WjUEHvW7e2c
https://youtu.be/wUYY0uoTE-M
https://youtu.be/jVsfgQadp6c
https://en.wikipedia.org/wiki/Kappa_(folklore)

This is one of sample.
http://fujitadougu.com/sushi/sushi-oshisushi.html
https://goo.gl/maps/ZUn8W7xPjQu
Shop list :
http://www.kappabashi.or.jp/search/shop.php?mode=view&lv1_catID=&lv2_c...

And calling "oshizusi no kata(押し寿司の型)" better than "box".
This "kata/型" is short of 型枠/kata-waku(frame) means forming block/former.
Or saying just "dougu(道具)/tool" enough.
Seems Japanesr 桧/hinoki wood best.
https://en.wikipedia.org/wiki/Chamaecyparis_obtusa
Hinoki is high spec wood especially strongest againt virus not only for kitchen items using widely.

But this item stocks not so many
so call strongly recommend before going if not enough days/time.
在庫/zaiko : stock(s)
A few shops e-mail acceptable.

Hi guys, thanks a lot for info.
Than you Nroc, now i have some idea for buying the thing.