of my favorite ministries are Gospel for Asia and Living Waters.
Both of them offer free (or virtually free) Christian books.
The first free book is called "Revolution in World
it describes the great effectiveness of native missions work.
It will refocus your mind on wise spending habits.
You can click on the following link: Gospel
for Asia or on the following image to get to the free book.
The second book is called "Revival's Golden Key" and
it talks about how the modern day method of evangelism can
lead to "backsliding believers" It is virtually free (~$1.00
/ book if you buy in bulk)
Waters Ministries - Evangelism training ministry of Ray
Comfort and Kirk Cameron (of Growing Pains!)
I might actually recommend you looking into his other book,
"Hell's Best Kept Secret" first, because it gives a more general
introduction to Evangelism.
If you want, you can listen to online sermons by Ray Comfort
and Kirk Cameron at Living
Free Christian Books Resources
Christian Classics Ethereal
If you find any other great Christian books that are available
for real cheap online, please tell me!
www.oneplace.com also offers free
online Christian sermons, from many well known speakers, such
as John Piper and John MacArthur.