Straighter Line is rapidly becoming a major option for earning college credit economically. When I first found them about two years ago, they only offered a couple of English, math, and business courses. In the years since, that offering has expanded to include courses in chemistry, anatomy, pharmacology, and biology, amongst others. They now have even more courses listed as "coming soon," like US History I, Western Civilization I, and Introduction to Business. At this rate, it will probably soon be possible to do the entire core curriculum for a college degree through Straighter Line, and the price of these courses is comparable to the cost of CLEP and DSST exams. They might be a better option for people who are living far away from a testing center, which is most people who aren't living near a large city or college town in the US.