You can get it on Ebay

Go to:

http://stores.ebay.com/DynamicDVD-Australia

Then do a search for the film's star surname "Jaturaphut"

It will come up.

I ordered the DVD from them, it arrived promptly, and it's a good quality release.

The subtitles are good, the picture sharp, the surround sound is great, and there are a number of different extras on the video.

Of course coming from Australia it's in PAL, so I don't know if it will work in the U.S.