I don't know if it's too late, but I would recommend against taking it at UC Berkeley Extension, just because it's something like $800 each for a pretty basic, introductory econ class. I've taken a few extension courses through Berkeley for their editing certification and also separately since I was an undergrad there...
I was in a similar situation 2 years ago -- had already graduated, but needed macro/micro to apply to programs. I took Macro + Micro online through a local community college (DeAnza College in Cupertino, CA)... That cost me something like $50 + cost of books for each class. The instructor was very good. I think that if you do all your reading and assignments, you will learn just as much as you would at any other university in introductory economics, and the grading is probably a bit more lenient than what you might find at Berkeley.