Someone passed this link on to me. for a
Kindle Price Drop Checker.
It is a service that will check Kindle prices on any ebook you want 4 times a day and alert you when it passes a threshold you set.
Looks like an intriguing idea. I may try it next time I feel a Kindle ebook is a little more than I want to spend right now.
Would be nice if there were one for other sites as well.