Three books in Thea Harrison's Elder Races series have dropped to £2.99 each at Kindle UK. Books in this series don't seem to drop in price very often, either in the US or the UK, so it's odd to see three at once...
Storm's Heart, #2
Kindle UK:
https://www.amazon.co.uk/gp/product/B005FVN9R0/
Kindle UK/Smile:
https://smile.amazon.co.uk/gp/product/B005FVN9R0/
Serpent's Kiss, #3
Kindle UK:
https://www.amazon.co.uk/dp/B005MZN1LS
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B005MZN1LS
Shadow's End, #9
Kindle UK:
https://www.amazon.co.uk/dp/B00ZPGBGDE
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B00ZPGBGDE