This is not my forte.
This has been a Johnny.Decimal blog post notification; see 21.05 Communications plan • Johnny.Decimal.
Lucky for you, Joel Spolsky has already done all the work for you and giving you an easy to follow, step-by-step guide on how to price the workbook with a definitive and useful answer.
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I only have a slight joke to add to the topic at hand: You have no competitors as far as I’m concerned. Melvil Dewey and John Locke have passed on, and we’re all still confused. 
Storied company indeed.
That was terrific.
The Workbook is now $0.04. Enjoy, everyone.