Oh, they cost more than that! This link expired but the article was a good one. I suppose you have to pay to get it now.

Washington Times:

In 2007, Legal and illegal aliens, cost the federal government more than $346 Billion dollars and the U.S. taxpayers paid more than $9,000. for each immigrant in the country!

http://www.washingtontimes.com/apps/...74/1002/NATION