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I don't think they charge for anything so hopefully this is ok to post:
You know how Amazon doesn't display Kindle prices on Wish List? Very annoying. Well this site lets you log in books you're watching, AND get emails if the price drops by $X. http://www.ereaderiq.com/pricewatch/
I haven't used it much, but I did manage to import my entire Wish List from Amazon.
I've used it a bit, and have gotten a few emails, but also got some on books I never entered but were 'similar'.
I haven't gotten any information from them in ages, but that could be because none of the prices on the ones I want have dropped.