There are a plethora of free SAT tests written by the College Board available on the Internet – not that you would know that by looking at their website. They only offer links to the 2012-2013 Official SAT Practice test.
But buried on their site are the Official SAT Practice tests from 2011-2012, 2007-2008, and 2004-2005 as well.
The Wayback Machine
If you are looking for even more, you can find older tests which are in the pre-2005 format (they still have reading analogies, math qualitative comparisons, and no writing section.) But they are still a useful source of Critical Reading questions and Math questions.
Here are the older tests: 2004-2005, 2003-2004, May 2002, Oct 2001, and another one.
I’ve got them all listed (with links to the answer sheets) on my Resources page.