The study guides offered from CollegeBoard can only be ordered online....I really don't want to use my credit card online, so is there another way of getting Clep subject guides and practice tests? Also, this $20 Official Clep Study Guide(?) book I've read about...I can't seem to find. The CollegeBoard has a downloadable one that my friend got for me a while back, but it was no where near $20, and couldn't fill a book. Thx!!