Thanks, daffy4u. I guess I'd never run into a book that was available before.
BOb, it's a per-book price. Amazon is calling it an "upgrade" - you have to already own a physical copy of the book (purchased through Amazon, I assume).
For instance, a book I bought back in 2003 costs $12.71 new (currently) and the upgrade is $3.19.
I'll probably have to try it just to see how it works, though I wish they had more books to choose from.
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