Amazon has the 'look' option for lots of ebooks, and the books where I've chosen that option I've been able to read usually the first 30 or so pages, depending on the nature of the book.
So, in a sense that option is already there, and it's free, and there's no obligation to buy.
No idea whether one could copy out that info in the 'look' view - didn't even think of it.
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