The official release of Kaiji: Final Game is now available to puchase online on Blu-ray and DVD. There will be three options available:

Blu-ray Normal Edition 
All Region / No Subtitle

DVD (Normal Edition)
Region 2 / No Subtitle

Blu-ray (Deluxe Edition)
All Region / No Subtitle
This version includes a bonus disc, and booklet.

Unfortunately, there are no English subtitles included in the release but you can find them to download here.