Elaine Viets seems to be working through putting the early titles in her Dead End Job series on Kindle Countdown. The fourth,
Just Murdered, is now on US Kindle Countdown at $0.99 for a few more hours before going up to $1.99. At Kindle UK it's at £0.99 for about a day-and-a-half more.
Kindle US:
https://www.amazon.com/dp/B079TFZ88P
Kindle UK:
https://www.amazon.co.uk/dp/B079TFZ88P