If you are looking for this specific edition on Polish marketplaces like Allegro , it is often listed with various DLCs or as part of special bundles:
Focuses on pirates and planetary militias.
The game is widely available on platforms such as Steam , where it maintains a "Very Positive" rating. Sins of a Solar Empire®: Rebellion on Steam
A package released in June 2019 that bundles the base game with all available DLCs.