Steven F Havill's books don't go on sale that often in the UK, but here's Final Payment, the fifteenth in the Posadas County series, on sale for £1.59 at Kindle UK, and £1.99 (but discountable) at Kobo UK:
Kindle UK:
https://www.amazon.co.uk/dp/B07VQN5NCR
Kobo UK:
https://www.kobo.com/gb/en/ebook/final-payment-5
I really like this police procedural series set in New Mexico...