Lunarachivist, i know a japanese online store that sells VHS, laserdisc and some VHD's too. I ordered some stuff from them, mainly laserdiscs. It's a bit expensive but the discs are very well packaged. The store is called Recobanchou, but their url is: http://www.urabanchou.com
Right now they are closed, but on January 25th they'll re-open the store.