Each new month brings a host of new deals from various places.
Lent
During this season of Lent you might find helpful Devotions for Lent:Meditations on Best-Loved Hymns by Robert Morgan Jr. (free). I worked through this one in 2014.
In 2014, I also worked through The Final Days of Jesus: The Most Important Week of the Most Important Person Who Ever Lived ($9.99) during Lent and especially the final week.
Christian Audio
Each month Christian Audio selects a book to offer totally free. The month of March is The Case for the Real Jesus by Lee Strobel
Lee Strobel was an atheist and an investigative journalist for the Chicago Tribune before he came to Christ. You can hear part of his story here and here.
Atheism
In light of the topic of atheism, there are several discounted books on kindle today that might help you; 1.) If you are an atheist. 2.) If you know an atheist.
Does God Exist? by William Lane Craig ($0.99);
Did Jesus Rise from the Dead? by William Lane Craig ($1.99);
20 Compelling Evidences That God Exists by Kenneth Boa and Robert Bowman – This one was ($0.99) on January 9th, 2015 not it is ($9.99).
Jump on the deals quickly because they only last a day or two generally. I typically do not purchase a kindle book over ($1.99) if I do it is really good or deeply discounted.
Baptism
Understanding Four Views on Baptism (Counterpoints series) by Various authors ($1.99); is also available today for those who are interested in understanding the differing views of the ordinance.