Want to complete your Miyazaki and Takahata DVD collection? I have good news for you. I'm adding direct links to the online merchants where you can purchase the DVDs. I'll be adding to the list when I can.
The Heidi and 3000 Leagues box sets come from JS DVD Mall, which hails from Taiwan. The Heidi set currently costs US$24.35, but does not include subtitles. The Marco set costs $30.17, and does include subtitles. Everything else comes from the YesAsia site, which is where I get all my movies. Both merchants have been very helpful to me, and I recommend them.
As always, you will need to override your DVD player's region lockout code in order to run these, but there are several options available. When I get back from work, I'll show you what you can do. Happy hunting!