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As a general rule, I'd not expect much past a week old to be valid. Many are not after a couple of days (and some from this A.M. are already gone in the original store, but have been picked up by Amazon).
Just check before clicking: if you see a price, that's what you'll pay, no matter what deal may or may not have been in effect earlier.
BTW, if you are a Kindle user, you can check the Free Kindle Reads tab on my blog - I keep a list of the current free books (non-public domain/non-sample), sorted by Genre. It can also end up out of date, but I update it at least once a day.
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