Where can one get this?

Here's the DVD from Amazon Japan:

http://www.amazon.co.jp/%E3%82%B2%E3%83%BC%E3%83%88%E3%83%BB%E3%83%88%E3%82%A5%E3%83%BB%E3%83%98%E3%83%B4%E3%83%B3-DVD-%E3%83%95%E3%82%A1%E3%82%A4%E3%83%88%E3%83%BB%E3%83%98%E3%83%AB%E3%83%9E%E3%83%BC/dp/B0006FGXZ0/ref=sr_1_1?ie=UTF8&s=dvd&qid=1230422422&sr=1-1

The whole film is in English, so no need to worry about subtitles. Make sure you click the "translate to English" option on the right side of the page before you order! At the moment it's 3779 yen, which is the average price for a DVD in Japan.