This is available on FUNimation's Dragon Ball Z: Rock the Dragon Collector's Edition DVD box set released on August 13, 2013.
The film was split up into three parts and aired on November 15, 1997 November 22, 1997 as the three part version and was aired on January 29, 1999 as a 'movie' version. The version that is included on the FUNImation 'Rock the Dragon' Collector's DVD Box set is the movie version.