Words of Radiance by Brandon Sanderson is currently on sale in the Kindle store for $3.75 here. Nice!
Executive Orders, the 8th novel in the Jack Ryan series, is on sale in the Kindle store for $2.80 here. I remember reading the book prior to this, which had a heck of an ending. Sounds like this one picks up right where that one left off.
The Last Kingdom by Bernard Cornwell is the 1st book in the Saxon Tales series (book 8 is due in January 2015). The Kindle edition is on sale for $4.99 ie=UTF8&camp=1789&creative=390957&creativeASIN=B000FC2RR2&linkCode=as2&tag=fanboonewrev-20&linkId=X2PICFYSHMX7M57F">here.
The Tom Dugan series by R.E. McDermott is a Countdown Deal in the Kindle store. The first book is free, and the next two books are just $0.99 each. I've never read anything by this author, but decided to pick up the series anyway since it was less than 2 bucks for all 3. The reviews seem good, though you never know. You can also add the audible editions of the first 2 books for $1.99 each. You can find all 3 books on the author's Amazon page here.
The Stingray Shuffle by Tim Dorsey is the 5th book in the Serge Storms series. If I remember correctly, it is one of my favorites in the series. Definitely worth downloading a sample. You can find the Kindle edition here. Note that a few other books in the series are $4.99.