As I've mentioned a time or three or three hundred, I really like Catherine Aird's CD Sloan series, now mostly republished (the earlier ones) in ebook by Open Road. And as Open Road titles, they tend to go on sale in the US pretty often, so I mostly don't post any more. But now here are three omnibuses of series titles on sale in the UK for decent prices (and one on sale in the US also)...
The Calleshire Chronicles Volume Three, includes
Parting Breath,
Some Die Eloquent, and
Passing Strange, £4.79 in the UK, $2.99 in the US
Kindle US:
https://www.amazon.com/dp/B07GWHRJNC
Kindle UK:
https://www.amazon.co.uk/dp/B07GWHRJNC
The Calleshire Chronicles Volume Four, includes
Last Respects,
Harm's Way, and
A Dead Liberty, £5.99 in the UK
Kindle UK:
https://www.amazon.co.uk/dp/B07GWCKBDF
The Calleshire Chronicles Volume Five, includes
The Body Politic,
A Going Concern,
After Effects, and
Injury Time, £4.79 in the UK
Kindle UK:
https://www.amazon.co.uk/dp/B07GWBVS4J