Where can I get a free mp3 of this song?

I went on Amazon.com and I found an mp3 I really liked. Here is all the info about it...The artist is Vitamin String Quartet and it is a tribute to Duran Duran's song "Ordinary World". I love it to death, as it's one of my boyfriend and my song...where could I get a free mp3 of it though? I can't find it anywhere else!!!