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.
A Cruel Wind by Glen Cook contains the first 3 novels of the Dread Empire series. You can pick up the Kindle edition for $1.99 here.
Cryptonomicon by Neal Stephenson is on sale in the Kindle store for $1.99. You can find it here.