Along with the book (http://startsustain.com), about starting and running your own web app, I included a simple project task list and a rather involved spreadsheet for helping to estimate revenue and expenses and easily adjust them to see the impact on revenue. My results might be moderately misleading because this spreadsheet was a significant component of value justifying the price.
The book was all new content, rather than repackaged blog posts, and I sold the package for $99 with occasional sales of $79 and $59. Prior to launch, I built up an announcement list of about 1,600 interested people. I did a poor job marketing to those people beforehand, but instead just sent out a single launch announcement.
It's been available for about 9 months now and sold over 500 copies for a total of about $45,000. I spent about $3,000 up front for cover design and editing.