With the next (5th) book in the Dewey Andres series due out in 2 weeks, the 4th book, Eye for an Eye, is on sale in the Kindle store for $2.99 here.
The Execution is the 2nd novel in the Jeremy Fisk series by Dick Wolfe and is currently on sale in the kindle store for $1.99 here. The 3rd book is due out in June.
Three novels in the Elvis Cole series by Robert Crais are on sale in the Kindle store for $2.99 each. It looks like you can also add the audio books for an extra $3.49 each.
Servant: The Dark God Book 1 by John D. Brown is on sale in the Kindle store for $0.99. You might remember the book was originally published by Tor several years ago, but the sequels were never released. If I understand correctly, the author rewrote parts of the first book and republished it on his own. He also published the other 2 books in the trilogy last year. I think there is a 4th book coming (maybe later this year)? For $0.99, I thought it was worth revisting this series.
Malice by John Gwynne is one of the Kindle Daily Deals today, so the sale price os $2.99 is only good today. You can find it here. The book was a slow start for me when I read it last year, but it gradually got better and I ended up enjoying it. Also, you can add the audible edition for an additional $2.99 today.