Do you have account of Amazon shopping?
International shipping is made easy with the Amazon Global program.
Shipping to outside of Japan is exempt from Japanese consumption tax.
We calculate the import fee deposit at checkout and provide customs
clearance on your behalf.

https://www.amazon.co.jp/b/?ie=UTF8&node=3534638051

After click this URL, please set up language in English.
And search word of NAHOK so that you can find the case which you need.
There are some NAHOK flute B foot, C foot, clarinet, oboe single case.
The price is Japanese price (cheeper than overseas price ) and add to pay
delivery fee and tax to AMAZON.
You can do it as same as ordinary Amazon shopping.