Amazon is offering Joe Haldeman’s The Forever War for Kindle for 23-cents ($11.99 value) for a limited time. Google also has it in their Play Store for the same price for a limited time.

In this novel, a landmark of science fiction that began as an MFA thesis for the Iowa Writers’ Workshop and went on to become an award-winning classic—inspiring a play, a graphic novel, and most recently an in-development film—man has taken to the stars, and soldiers fighting the wars of the future return to Earth forever alienated from their home.

Amazon is offering  Steven Levitt and Stephen Dubner’s Think Like a Freak: The Authors of Freakonomics Offer to Retrain Your Brain for Kindle for $1.99 ($28.99 value) for a limited time.

Google also has Think Like a Freak Ebook in the Google Play Store $1.99 for a limited time.

With Think Like a Freak, Steven D. Levitt and Stephen J. Dubner have written their most revolutionary book yet. With their trademark blend of captivating storytelling and unconventional analysis, they take us inside their thought process and teach us all to think a bit more productively, more creatively, more rationally—to think, that is, like a Freak.

Levitt and Dubner offer a blueprint for an entirely new way to solve problems, whether your interest lies in minor lifehacks or major global reforms. As always, no topic is off-limits. They range from business to philanthropy to sports to politics, all with the goal of retraining your brain. Along the way, you’ll learn the secrets of a Japanese hot-dog-eating champion, the reason an Australian doctor swallowed a batch of dangerous bacteria, and why Nigerian e-mail scammers make a point of saying they’re from Nigeria.