Not much to add here. Michael Sullivan talks about the impacts on his book prices due to negotiations between Hachette and Amazon:
I was pretty sure Amazon and Hachette were in contract negotiations long before the announcement on May 9th when the New York Times broke the story. You see, on February 7th, the discounts for all my Riyria books listed on Amazon.com vanished, raising my ebooks from $8.59 – $8.89 to $9.99 and my print books from $11.41 – $13.80 to $16.00 or $17.00. What was even more disturbing, however, was the discounts on most of my fellow Orbit (the fantasy imprint of Hachette) author’s books disappeared as well. Even as I write this, I see the only paperbacks which are discounted are those in pre-release or books published in April or May. Also, the discounts are just 10% rather than the usual 25% – 30%. Even hardcover editions of front list titles such as Brian McClellan’s The Crimson Campaign (released May 6th), and James S.A. Cory’s latest book in The Expanse series (releasing June 17th) are currently full price.
There are graphs here, and scary numbers:
From this data I’ve seen my print book sales drop to 54.8% of what they were before this all started. There could be many reasons for this, but I’m concerned the higher price of my books, and the lack of their availability, has led many fantasy readers to opt for a book from other authors that were cheaper and easier to get. It also seems to indicate a good portion of my particular readership buys print books from Amazon, as listings at other sites remained unchanged.
Keeping in mind this is a single author's pespective, you ought to read on here: http://www.digitalbookworld.com/2014/an-authors-perspective-on-the-hachette-amazon-battle/