Hello!
I just added a compilation pack of 20 tracks ideal for Sci-Fi / Futuristic settings, including Space, Alien and Post-apocalyptic sounds.
The pack is $5, or 25c per track! You can find tracklist, demos, and the pack itself at the link below:
https://eamon-music.itch.io/sci-fi-music-ambience
Source: itch.io