Source for movie
http://www.eztakes.com/store/movie/The-Battle-of-San-Pietro-and-Marines-at-Tarawa-Return-to-Guam-Movie-Download.jsp
To ask $77 on amazon.com for this (on VHS!) is outrageous.
I'm not acting as anybody's agent, BTW, the only reason I looked it up is because of it's mention in Rick Atkinson's book "The Day Of Battle".