For the price of the Iraq War, we could've bought the world's cinnamon harvest for the next ten thousand years.
Image used under a Creative Commons license from Kiri :D.
135,000 metric tons of cinnamon were harvested in 2005. At 2001 prices, this much cinnamon was valued at $235 million. Adjusting for inflation into 2008 dollars, buying this much cinnamon for ten thousand years would cost $2.90 trillion, or $100 billion less than Joseph Stiglitz and Linda Bilmes' estimate of $3 trillion for the total cost of the Iraq War.