Now the first three books in Julia Huni's six-book follow-on to her "Space Janitor" series, called accurately, but not super-imaginatively, "Tales of a Former Space Janitor", are either free or $0.99/£0.99. These are all KU right now too, but books do fall out of KU sometimes, so I grab if they are free, and even sometimes at the $0.99/£0.99 price too, if I've liked them a lot.
The Rings of Grissom, #1, free
Kindle US:
https://www.amazon.com/dp/B08RRM4876
Kindle UK:
https://www.amazon.co.uk/dp/B08RRM4876
Planetary Spin Cycle, #2, $0.99/£0.99
Kindle US:
https://www.amazon.com/dp/B094MQT24Z
Kindle UK:
https://www.amazon.co.uk/dp/B094MQT24Z
Waxing the Moon of Lewei, #3, $0.99/£0.99
Kindle US:
https://www.amazon.com/dp/B09KSBWL9Q
Kindle UK:
https://www.amazon.co.uk/dp/B09KSBWL9Q
These are Kindle Countdown Deals for about a day-and-a-half more...