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M$1 Answer
Here's a MSNBC video disscussing how much it cost.
From - http://mediamatters.org/items/200901180003
"[i]n 2004, to note, the inauguration of George W. Bush cost roughly $40 million." Later in the paragraph it states that it doesn't include include security and transportation costs
However the costs are included in the $150 million that has been reported for Obama's inauguration.
"The $40 million (Bush inauguration cost) does not include the cost of a web of security, including everything from 7,000 troops to volunteer police officers from far away, to some of the most sophisticated detection and protection equipment." - http://www.examiner.com/x-243-Progressive-Politics-Examiner~topic66108-Obama-inauguration-cost
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M$
Also, you didn't specify whether you wanted to know about the 2001 or 2005 inauguration...
I assumed you meant 2005.