Crossway offers a nice list of really cheap Kindle books on salvation, atonement, resurrection...
- One With Christ by Marcus Peter Johnson ($1.99)
- Raised With Christ by Adrain Warnock ($1.99)
- Salvation Accomplished By The Son by Robert Peterson ($2.99)
- Precious Blood with contributions by Joel Beeke, Phil Ryken, Richard Phillips, R.C. Sproul and others ($1.99)
Gladwell and others...
- The Tipping Point & Outliers by Malcolm Gladwell ($3.99)
- Quiet: The Power of Introverts In A... by Susan Cain ($2.99)
- Thinking Fast & Slow by Daniel Kahneman ($2.99)
Also check out other Kindle sale books here.