You can try Yesasia.com. They sell imported stuff from Japan, so there might be better luck there.
but check the region of the dvd first cuz japans dvd don t wor on american dvd players, unless you have region free software on you computer dvd player, also unless noted they wont have english subtitles,
otherwise you might keep an eye out for hong kong imports most of them have english subtitles, tho they might not be the best