That's what the Department of Defense says the U.S. is spending on the occupation of Iraq: $4,500,000,000 per month.
That's $54,000,000,000 per year, but Bush just asked for $120,000,000,000 more from Congress for the rest of 2006, most of it for the Iraq operation. It is estimated that $250,000,000,000 has already been spent for Iraq since the invasion in March 2003, almost three years ago.
So it looks like the cost is more like twice what the DD says: $200,000 per minute, $300,000,000 per day, $9,000,000,000 per month.
If you're going to destroy a country, it obviously requires a hell of a lot of cash to do a thorough job of it. Sacrifice is demanded from all of us.