Elaine Viets' Dead End jobs books go free often enough that I mostly don't post anymore. But right now there are two ominbuses from that series that are free at the same time, and it's been a while, and I liked this series back in the 2000s in DTB, so here you go...
The Dead-End Job Mysteries: Volume 1-3, contains
Shop Till You Drop,
Murder Between the Covers, and
Dying to Call You
Kindle US:
https://www.amazon.com/dp/B08SSG6MCD
Kindle UK:
https://www.amazon.co.uk/dp/B08SSG6MCD
The Dead-End Job Mysteries: Volume 4-6, contains
Just Murdered,
Murder Unleashed, and
Murder with Reservations
Kindle US:
https://www.amazon.com/dp/B08ZK18V95
Kindle UK:
https://www.amazon.co.uk/dp/B08ZK18V95