In addition to the fantastic deal you can still take advantage of regarding Daniel Goldhagen's latest book, Mark Vuletic - who apparently can read at the same pace as Johhny 5 from Short Circuit - has spotted several other bargain priced Kindle books:
Republican Gomorrah: Inside the Movement that Shattered the Party by Max Blumenthal for $1.79
The Language Instinct: How The Mind Creates Language by Steven Pinker for $2.99
In Republican Gomorrah, Blumenthal examines the history of the Christian right, how it captured the Republican party, and the personality defects of some of its leading figures. Before I read the book, I was sold on it by Frank Schaeffer's review, so I'll simply let that link do my talking for me.
I have not read The Language Instinct, but I have read several other of Pinker's works, including The Stuff of Thought: Language as a Window into Human Nature; his works are always deeply engaging, lucid, and richly humanistic - I consider Pinker one of the best science popularizers around.