Two books in PD James' Adam Dalgliesh series are on sale for £1.79 each at Kindle UK...
Shroud for a Nightingale, #4
Kindle UK:
https://www.amazon.co.uk/dp/B002RI9YAK
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B002RI9YAK
The Black Tower, #5
Kindle UK:
https://www.amazon.co.uk/dp/B002RI90DQ
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B002RI90DQ