I'm a huge fan of Peter Tremayne's Sister Fidelma historical series, but the vast majority of his books are insanely priced in the US at $12.99, even the decades old backlist. And they almost never go on sale.
In the UK, it's a different story, with most of the books at £3.99 and only a few, mostly recent, at £4.99 or up. So it's not that much of a sale when a couple of them drop to £2.99, but WTH...here you go...
Smoke in the Wind, #11
Kindle UK:
https://www.amazon.co.uk/dp/B0037472ZM
Bloodmoon, #25
Kindle UK:
https://www.amazon.co.uk/dp/B0746MK685