A big batch of Sister Fidelma titles by Peter Tremayne have dropped to £2.99 each at Kindle UK right now. I really really like this series, enough that I made my husband go to Cashel for the weekend a few years ago, when we had a business trip to Ireland. Even though the ruins left there now date from much later than Fidelma’s time.
The sale books are kind of scattered throughout the series. Most of these books are $14 and up in the US and rarely go on sale. They are mostly usually £5.49 in the UK, which is way better than $14, but £2.99 is even better! The links pick up all the sale books, but may also pick up a stray or two.