Oh! I know of one place. Although my friend used to order K-dramas boxsets from there, so I’m not sure how many movies there would be.
Other than Amazon.co.jp (you can order from Amazon Japan!), I’m thinking of Yes Asia!
It just came to me. I haven’t used the site myself, however all her boxsets looked pristine, and worked well. (She had them shipped to Canada, we were roommates for about a year and a half.)
EDIT: Link directly to Japanese Movies (at YesAsia).
EDIT 2: From a quick glance poking about for about 3 minutes, the prices are steep. As steep as I would’ve expected 10-15 years ago.
EDIT 3: Oooh, a search taught me that my favourite Drama had a movie that takes place after the 2 series.


I have absolutely no idea where to look online for live action Japanese films, sadly.