The three CD bocx with Nowowiejski's ballet music (op. 18 & 37) is not a commercial edition. Anyway you can try to ask for it the publisher, Agencja Artystyczna Kameny form Cracow: kontaktmanageras@gmail.com
As I know, there are going to record the complete operas by Nowowiejski in 2018, "Legenda Bałtyku" was performed and recorded in December 2017 (http://kameny.pl/muzyka/). They also pulblished CD with orchestrated "Tatra Album" and Violin Concerto by Paderewski.
On their website (only in Polish) you can find some more details: http://kameny.pl/projekty/
As I know, there are going to record the complete operas by Nowowiejski in 2018, "Legenda Bałtyku" was performed and recorded in December 2017 (http://kameny.pl/muzyka/). They also pulblished CD with orchestrated "Tatra Album" and Violin Concerto by Paderewski.
On their website (only in Polish) you can find some more details: http://kameny.pl/projekty/