Board Thread:Questions and Answers/@comment-10644834-20130611075456/@comment-53539-20130611201721

There are also lots of doujin groups doing Vocaloid songs, so some of their albums have also never been released officially on sites like Karen-T. To buy these albums, you'd have to attend the Vocaloid related events such as The Voc@loid M@ster. :-/