Here are some sources of airfoil polar information:
http://soaring.cnde.iastate.edu/calcs/frames.shtml
http://www.nasg.com/afdb/index-e.phtml
Soartech 8
Summary of Low-Speed Airfoil Data, Vols. 1, 2, and 3; by M. Selig, etal.,
Soartech Publications
1504 North Horseshoe Circle
Virginia Beach,VA 23451
The hard copy publications are also available from the publishers of Flying Models magazine (I forget the name).
You can also download a free copy of X-foil by Dr. Mark Drela at:
http://raphael.mit.edu/xfoil/
You can use the X-foil program as a vitrual windtunnel to generate the polars from the airfoil coordinates that you input to the program. This is the most powerful tool of all when you learn how to use it.