Summer School vs. Internship

I have been admitted into a solid master's program for finance contingent on my completion of a course in corporate finance and intermediate microeconomics. The program also highly suggests (and rightfully so) students obtain full-time internships over the summer. So I'm stuck essentially deciding between a full-time internship and summer school UNLESS I can find online courses that are legitimate substitutes or night classes in the Los Angeles area. I am a transfer student so despite entering school with a year's worth of credits I am still beyond maxed out trying to graduate next semester and thus cannot take more units.

So....does anyone in here know of good b-school online, accredited courses. I have searched tirelessly but can't seem to find any good ones offered over the summer. If anyone has any insight I would greatly appreciate it.

Thanks! gcjohns