Madman has de-listed Sailor Moon Sailor Stars Part 2 from their website and their December 2020 releases list on their b2b website. I've checked the list for January 2021 releases, and it's not listed.
In terms of BDs, the only ones available on their website are the complete sets of Sailor Moon R and Sailor Moon S, the movies of R and S, and Crystal Part 3. Sailor Moon SuperS Part 2 and Crystal Part 1 CE are also listed, but have noted as out of stock.
As for DVDs, the ones remaining are Sailor Moon Season 1 (Part 1 SE and the Complete Collection), Sailor Moon R (Part 1 CE, Part 1 SE, Part 2, Complete Collection and the movie), Sailor Moon S (Part 1 SE, Part 2, the Complete Collection and the movie), Sailor Moon SuperS (Part 1 SE, Part 2 and the movie), and Sailor Moon Crystal (all 3 parts).
Sailor Moon Sailor Stars Part 1 is unavailable on both formats.