Five James Lee Burke/Dave Robicheaux books are £2.99 at Kindle UK. Not a great price, but not too bad either. And especially since they tend to be $9.99 and up in the US, and a bunch at $13.99 - even the decades old backlist.
Burning Angel, #8
Kindle UK:
https://www.amazon.co.uk/dp/B003TO5AK4
Sunset Limited, #10
Kindle UK:
https://www.amazon.co.uk/dp/B004KSRZSI
Purple Cane Road, #11
Kindle UK:
https://www.amazon.co.uk/dp/B004BDOJYA
Creole Belle, #19
Kindle UK:
https://www.amazon.co.uk/dp/B0089YH7LO
Robicheaux, You Know My Name (apa just
Robicheaux)
Kindle UK:
https://www.amazon.co.uk/dp/B07572K5B3
As an aside, I love a lot of the titles in this series, just for the titles (even if the books weren't good too):
In the Electric Mist With Confederate Dead,
Purple Cane Road,
Last Car To Elysian Fields,
Pegasus Descending ... but really, almost all of them ...