For the next three days, you can download Michael J. Sullivan's Hollow World for only 0.99$ here.
Here's the blurb:
THE FUTURE IS COMING...FOR SOME SOONER THAN OTHERS Ellis Rogers is an ordinary man who is about to embark on an extraordinary journey. All his life he has played it safe and done the right thing, but when diagnosed with a terminal illness, he's willing to take an insane gamble. He's built a time machine in his garage, and if it works, he'll face a world that challenges his understanding of what it means to be human, what it takes to love, and the cost of paradise. Ellis could find more than a cure for his disease; he might find what everyone has been searching for since time began -- but only if he can survive the Hollow World. Welcome to the future and a new science fiction thriller from the bestselling author of the Riyria Revelations and the Riyria Chronicles. Sullivan's novels have been translated into fifteen foreign languages, and have been selected for more than ninety best of the year or most anticipated lists, including those compiled by Library Journal, Barnes & Noble.com, and Goodreads. NOTE: This ebook contains a PG-13 version for those that object to explicit language.
You can still download Joe Haldeman's classic, The Forever War, for only 4.55$ here.
Here's the blurb:
A THOUSAND YEAR CONFLICT. ONE SOLDIER LIVES THROUGH IT ALL. CAN HE MAINTAIN HIS HUMANITY?
The Forever War is a science fiction classic that chronicles the life of William Mandella. Due to the time distortion associated with deep space travel, he is present during both the first and the last battle of a thousand year old conflict with the alien Taurans.
A masterpiece of not just science fiction, The Forever War illustrates the futility of all wars and their effect on the human soul.
The Forever War won all major science fiction awards including the Hugo, Nebula and Locus. Ridley Scott, director of Blade Runner and Alien, is currently adapting this classic for film.
This is the author's preferred version and includes a foreword by John Scalzi, author of Old Man's War.