Use promo for e-version of book

I have a promo code for iPhone 3G missing manual. How do I use it for the electronic version?

Also can you explain why you promote e-versions as a way to save a tree but make the price the same as the physical book [printing (ink and paper) binding (cover and glue) distribution (fleet, gas) sales management (bookstore who stock the book) inventory (physical space to store the books)]
 
sad I’m confused
Inappropriate?
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