You can now download Karen Traviss' Halo: Glasslands for only 2.99$ here.
Here's the blurb:
The Covenant has collapsed after a long, brutal war that saw billions slaughtered on Earth and her colonies. For the first time in decades, however, peace finally seems possible. But though the fighting's stopped, the war is far from over: it's just gone underground. The UNSC's feared and secretive Office of Naval Intelligence recruits Kilo-Five, a team of ODSTs, a Spartan, and a diabolical AI to accelerate the Sangheili insurrection. Meanwhile, the Arbiter, the defector turned leader of a broken Covenant, struggles to stave off civil war among his divided people.
Across the galazy, a woman thought to have died on Reach is actually very much alive. Chief scientist Dr. Catherine Halsey broke every law in the book to create the Spartans, and now she's broken some more to save them. Marooned with Chief Mendez and a Spartan team in a Forerunner slipspace bubble hidden in the destroyed planet Onyx, she finds that the shield world has been guarding an ancient secret – a treasure trove of Forerunner technology that will change everything for the UNSC and mankind.
As Kilo-Five joins the hunt for Halsey, humanity’s violent past begins to catch up with all of them as disgruntled colony Venezia has been biding its time to strike at Earth, and its most dangerous terrorist has an old, painful link with both Halsey and Kilo-Five that will test everyone’s loyalty to the limit.
You can also get your hands on Halo: The Thursday War for the same price here.
Here's the blurb:
Welcome to humanity’s new war: silent, high stakes, and unseen. This is a life-or-death mission for ONI’s black-ops team, Kilo-Five, which is tasked with preventing the ruthless Elites, once the military leaders of the Covenant, from regrouping and threatening humankind again. What began as a routine dirty-tricks operation―keeping the Elites busy with their own insurrection―turns into a desperate bid to extract one member of Kilo-Five from the seething heart of an alien civil war. But troubles never come singly for Kilo-Five. Colonial terrorism is once again surfacing on one of the worlds that survived the war against the Covenant, and the man behind it is much more than just a name to Spartan-010. Meanwhile, the treasure trove of Forerunner technology recovered from the shield world of Onyx is being put to work while a kidnapped Elite plots vengeance on the humans he fears will bring his people to the brink of destruction.