There are a bunch of eBooks hosted on BrainyThoughts.com.
Science of Getting Rich, by Wallace D Wattles
The Edinburgh Lectures, by Thomas Troward
Acres of Diamonds, by Russell Conwell
Art of Money Getting, by PT Barnum
The Prophet, by Kahlil Gibran
As A Man Thinketh, by James Allen
Spiritual Laws, by Emerson
Compensation, by Emerson
A Message To Garcia, by Elbert Hubbard
The Master Key System, by Charles Haanel
And the master of them all; Think and grow rich, by Napoleon Hill