http://cty.jhu.edu/ctyonline/math/courses/algebra1.html

http://www.ctd.northwestern.edu/gll/courses/core/fall2011/#Mathematics

http://www.artofproblemsolving.com/School/index.php?

I can't speak to the quality of any of these courses, it's just what I found when I was going through my bookmarks. Good luck!