Rose Publishing has been discounting a rotating batch of their $3.99 pamphlets to $.79 at Christianbook.
Four Views of the End Times explains the difference between dispensational premillenialism, historical premillenialism, amillenialism and postmillenialism. I can never keep track of who thinks the thousand years starts when, so it's worth 79 cents to me to have an easy place to look it up.
Though perhaps appealing to a narrower audience, I picked up three more 79 cent pamphlets that sounded fun:
10 Q&A On Magic, Spells and Divination (just in time for Halloween!)
Answers to Evolution
Christianity, Cults, and the Occult
Edit: The PDF link in the
Answers to Evolution ebook gave a 404, but a Rose Publishing customer service rep emailed the pamphlet to me after I forwarded my Christianbook receipt.