Amazon wishlist: how to monitor it properly?

Hi there!

As a frequent user of Steam I've gotten used to a wishlist that comes with notifications when things goes on sale, so when I recently got a Kindle and started buying (hoarding ehm) e-books, I've found that the Amazon wishlist is frustratingly hard to make effective use of, at least when it gets filled up. And Amazon does not offer any notification service, not even a feature to filter your wishlist in any meaningful way.
So, I tried this service called CamelCamelCamel.com, which lets you upload your wishlist and you can set parameters for it to monitor.
Unfortunately, I can't really see that's it of any effective use to, if that's due to the service or rather my own incompetence , I'm not sure, but I'm looking for alternatives now.

Is there any site that lets you monitor or filter your Amazon wishlist after discount/sales by percentage? Ideally, I would like to be notified if books go down in price by, say, 45% or more. I tried to set CamelCamelCamel up this way, but instead I receive mails when books go down by $0.50-1.00 and such :P

Do you know about a decent way to monitor your Amazon wishlist?