Thread:Titanollante/@comment-7165120-20140414184150/@comment-3367060-20140414220442

I found one place where you can get it:

There is ONE double feature DVD of Gamera vs. Gyaos and The Magic Serpent on eBay here: https://www.google.com/#q=the+magic+serpent+DVD&tbm=shop&spd=17555712014480302559

Other than that, I don't know where or how you can find it other than getting some yen and importing it--along with a Japanese DVD player--from Japan.