You can find three free translations including the Lionel on www.archive.org
http://www.archive.org/search.php?query=creator:%22Sun%20Tzu%22
I prefer The Art of War: The Denma Translation (Shambhala Library) personally, compared to a 1950s translation I read when in college.
Also free, the original 1910 Giles translation, 1st edition scanned:
http://www.archive.org/details/artofwaroldestmi00suntuoft
Thank you, those are quite useful.