Simple: Amazon is discounting the title heavily from the digital list price ($30) to the not-standard-for-very-much-longer Kindle bestseller price of $9.99. Kobo isn't discounting it as heavily (it's showing there at $17.99 right now). Cyberrread, Fictionwise, Lulu, and eBooks.com aren't discounting it at all, and selling it for the list price of $30. Other stores are somewhere in-between.
Welcome to the perfectly clear, always logical world of e-book pricing.
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