Three books in JD Robb's In Death series are on sale right now at Kindle UK...
Judgement In Death, #11, £0.99
Kindle UK:
https://www.amazon.co.uk/dp/B003O86FHW
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B003O86FHW
Divided In Death, #18, £2.99
Kindle UK:
https://www.amazon.co.uk/dp/B003O86FJK
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B003O86FJK
Delusion in Death, #35, £2.99
Kindle UK:
https://www.amazon.co.uk/dp/B008H33VGW
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B008H33VGW