there are many interesting shops in Japan... but they do not ship overseas...
So... You need a friend in Japan or flight to Japan.. :-)
http://www.militant.jp/
http://www.ranger.ne.jp/
http://tatezakura.jp/
Overseas shipping:
http://www4.ocn.ne.jp/~golani/ nothing on web page, need contact by e-mail, very high prices, he will find everything...
owner has been in JGSDF
https://www.sandgraf.jp/ great customer service but poor made stuff