Admittedly, some of these aren't the greatest deals ever, but the best I've found for Kearney's Macht series. Then, there are some good deals on some classics of science fiction and fantasy.
The Ten Thousand (Macht 1) by Paul Kearney ($5.87)
Corvus (Macht 2) by Paul Kearney ($5.87)
Kings of the Morning (Macht 3) by Paul Kearney ($5.87)
Brave New World by Aldous Huxley ($2.99)
Slaughterhouse-Five by Kurt Vonnegut ($2.99)
Cat's Cradle by Kurt Vonnegut ($2.99)
Breakfast of Champions by Kurt Vonnegut ($2.99)
Welcome to the Monkey House by Kurt Vonnegut (short stories) ($2.99) - My review.
The Giver by Lois Lowry ($4.70)
I Am Legend by Richard Matheson ($2.99) - Keep in mind this is novella-length. The normal volume that includes this story has a bunch of Matheson's short stories as well.
The Fellowship of the Ring (Lord of the Rings, book 1) by JRR Tolkien ($3.99)
Also check out the last eBook deals post (two posts down), where I updated one of the entries.