Three Ilona Andrews books are £0.99 each at Kindle UK right now. All have been on sale before. Possibly as part of the monthly sale, but I wouldn't count on it. Or possibly in honor of the new Kate Daniels novella,
Magic Tides, coming out on Jan 17. (Kate and family are in Wilmington, several years after the end of the previous series, a couple of years before
Blood Heir, I have an ARC and liked it a lot, but haven't yet gotten my review written...) In any case, here you go...
Magic Bites, Kate Daniels, #1
Kindle UK:
https://www.amazon.co.uk/dp/B0043M67BW
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B0043M67BW
Fated Blades, most recent Kinsmen, either a short book or a long novella

Kindle UK:
https://www.amazon.co.uk/dp/B09G9VJTKT
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B09G9VJTKT
Emerald Blaze, Hidden Legacy #5, middle book in Catalina's story arc
Kindle UK:
https://www.amazon.co.uk/dp/B081ZGKN7H
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B081ZGKN7H