I got the e-book version of Three Cups directly from the publisher at Booksneeze.com. I did like the illustrations even on the e-book version, however, I was a little bit disappointed by the simplicity of the book. I'm not sure if it's because I already am aware of the idea of breaking your finances up into three cups, or if I wanted a little more "story" along with the instructions.
I have actually tried the concept in the past with my children and had little luck. Every single one of them ended up "playing" with the cups -- dumping the money out and stacking it up...and I found it very hard to pay the children with the three cup method. For example, you cannot give a child a $5 bill, or a $1 bill... you have to give him a sum that is able to be broken up according to your spending habits.
So maybe my experiences colored my view of the book in a negative light. It is beautifully illustrated but overly simplistic. I'd like to see somewhere in the back some information on how to make this work in the real world.