What college do you go to? They may accept any one of the Math CLEP Test.
If you haven't heard of CLEP, basically it's an easy way to earn college credit by testing out of college classes. For less than $100 you can earn credit for a math class. CLEP offers 4 math tests: College Math, College Algebra, Pre-Calculus, and Calculus.
And honestly, online classes are self taught anyway, so it's not like you're missing much without an instructor!
Here's a good YouTube video that explains more -> http://www.youtube.com/watch?v=iKWrsV2zqFs&feature=plcp
You can find out if your school accepts CLEP by going to the school website and searching "CLEP" and seeing which exams they accept <about 50% of colleges accept CLEP credit>.
Let me know if this helps!