Defiance, the most current book in the Foreigner series by CJ Cherryh,
is on sale at Amazon for $1.99.
I highly recommend the series if you enjoy political science fiction. Essentially a colony ship arrived at a planet a couple of hundred years before the story starts, and finds a sentient species already populates the planet. They don't have the resources to go somewhere else so they end up establishing a colony anyway. It's a first-contact story with humans as the aliens.