I have a favorite target of mine that I have used, all one inch squares with two solid black squares for bullseyes. This one is close to what I use. There is a large variety of targets on their web that you can print off. I think I will take this one to Kinko's and run off 100, probably cheaper than using my own printer.
http://www.targetz.com/targetzlib/10001.pdf , this is the same as the attached file.
Here is the web site
Thanks for the link...that should save a few bucks.