Three books towards the end of David Wishart's Marcus Corvinus series have dropped to £2.84 each. (I wonder how they came up with the price, especially since the publisher, Severn House, is a UK publisher, and presumably would price "natively" in UK currency...) This is one of my top five favorite series, not least, as I've mentioned before, for the historical notes at the end of most, but not all, of them. But it does seem to be a bit of a love-it-or-hate-it series...
Solid Citizens, #15
Kindle UK:
https://www.amazon.co.uk/dp/B00FFYW7SY
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B00FFYW7SY
Trade Secrets, #17
Kindle UK:
https://www.amazon.co.uk/dp/B01AAGLV0Q
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B01AAGLV0Q
Foreign Bodies, #18
Kindle UK:
https://www.amazon.co.uk/dp/B01N5CV26P
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B01N5CV26P
Oh, and if you like it, most of the rest of the series is pretty reasonably priced (in the UK) at £0.99 to £2.99...