http://www.lybrary.com/magicians-diy-tip......831.html

The absolute, bar none, best $15 I have spent on magic in years.

"With contributions by Jack Poulter, Wilhelm Eberhard, Chuck Smith, Bruce Kalver, Jeff Stone, Robert Kaldy-Karo and ***********. This PDF will be updated periodically as I discover new tips and tricks. Every customer will get access to all future updated editions."
**edit - direct quote from site, don't know why the one name was ***'d out when I submitted the post**

This ebook is full of money saving tips and DIY ideas, it literally pays for itself in one quick reading. Some ideas have been known for a long time ie. substitutes for fanning powder and roughing fluid, but there are also ideas on how to make your own flash paper if you are in a pinch (or don't want to waste your expensive sheets).

This is my favorite site for obtaining ebooks. Its run by the author of this particular book and he offers many great magic books, some supplies (corner rounders, card cutters, card stock and finish) also some fine blogging on DIY card gaffing.