Three titles in Reed Farrel Coleman's continuation of Robert B. Parker's Jesse Stone series have dropped to £1.89 or £1.99 at Kindle UK. I've read a couple of these continuation titles and enjoyed them.
Blind Spot, continuation #1:
https://www.amazon.co.uk/dp/B013EU2DO8
Debt to Pay, #3:
https://www.amazon.co.uk/dp/B06Y3XDGWB
The Hangman's Sonnet, #4:
https://www.amazon.co.uk/dp/B076H2NVK4