SusannaG has already posted one of the books on my sale alert with links here - it was Duel with the Devil, with a very long full title about a murder with Alexander Hamilton and Aaron Burr in on the history. As far as I've read it's factual. But because I've already been sucked into multiple sales this week, I have to pass on that one.
[Prices, as always, probably going to only on sale in the US. But worth a check on your end, just in case.]
I usually always give in on $1.99 sales too - but my brain (the Book Greed Center, wherever that's located in there) already wheedled me into buying these:
Cooking for Kings by Ian Kelly ($2.99)
I've had this on my Want list for some time because there aren't a lot of books (especially in English), about Marie-Antoine Carême. Check out that wikipedia link and I think you'll see why I found him interesting. I've waited for years for the ebook to go on sale and this is the first time I've seen one.
A Curious Man: The Strange and Brillian Life of Robert "Believe It Or Not!" Ripley, by Neal Thompson ($3.99)
In my continual quest to read all books on things strange Ripley comes up a lot. His...er field is much more in the P.T. Barnum line (mixed with cartooning) than nonfiction, but his bio should be fun. Hopefully. Also the first time I've had notification of a sale on this one.
And no longer on sale, but adding for the interest:
Got this from a Daily Deals tip at Dear Author and since I've been slowly reading Montaigne's essays (yay public domain ebooks) this seemed a good time to snap up this bio. It was also $1.99 at the time (now back to 8.99, sorry), which made it an easy impulse buy.
If you're into impulse buys and sales I'd say to take a peek at Dear Author's Daily Deals, even if the romance genre isn't your thing. They regularly post nonfiction, scifi and fantasy, and the prices are usually under $3.00. Also there are links to multiple stores, not just Amazon.
Oh and I get my Amazon sale info email notifications via EreaderIQ. Short version: add the books and the price you want an email alert for, if it ever drops that low. (I've not trusted them for a full import of my wish list because I don't do that with online services in general.) Only works for ebooks. There's also an area just for adding a list of paper books so you can find out when/if they're released as ebooks. (Which doesn't work 100% of the time.)
[As always, I'm not affiliated with any of the sites I link! I'd tell you if so! Also I'd dither over it too because as a rule I never blog about work.]
[Warning: both Daily Deals and EReaderIQ vastly increased my ebook buying since I first started reading/using. So, just a heads up. In case you too have a weakness for book sales.]