In the spirit of 99-cent books on Kindle, I found an author on Kindle named John Locke, who has written about 6 books about his assassin-protagonist Donovan Creed (he also wrote a western, of all things, which was also very good). He seems to be a Kindle-only sensation. I have not seen him other places but a while back he had all his books in the top 100 at the same time.
The books are short and an easy read. This is not Hemingway, these are classic summer beach books, but I found him pretty enjoyable.