Bargain @ 99 cents for US-only from the "HarperCollins e-books" imprint:
There's a whole slew of non-fiction currently marked down, including biographies, military histories, self-help, cookbooks, etc.
You can probably try getting them at the OmniLit 50% rebate Hallowe'en sale mentioned in GeoffR's
alert thread and also be eligible for the Buy 10 Get 1 Free deal, or they're cheap enough that you can go to your favourite US store for them.
Here's the
Kobo auto-search for the imprint, sorted by price and filtered by category so you can scroll through and spot if there's anything which looks interesting to you.
My personal pick out of the lot is probably going to be Russell Lynes'
Snobs: The Classic Guidebook to Your Friends, Your Enemies, Your Colleagues, and Yourself, a satirical pseudo-sociology work which I think I've actually read a long time ago via the library.
And I think I'll also get this biography of chemist Fritz Haber, who received the Nobel Prize for inventing the process by which we synthesize ammonia, which pretty much changed our modern way of life:
Master Mind (there's a really good 2-volume French bande déssiné biography of him out there, the name/creator of which unfortunately slips my mind)