Upload & Sell: Off
...Im a college student and am doing my internship in photography and really need a good flash for what im doing
Considering your needs and goals, a flash is one area where I wouldn't skimp. A Canon-brand Speedlite is a major purchase, but it is one that will last and can be moved from camera to camera as you progress.
If you can't fit one into your budget in one chunk you might look into a Best Buy credit line, hit up family and friends (with a written repayment plan), etc.
In the long run, I think you'll be happier. Plus, as an intern you might land some future work opportunities that might not be offered if you present a "less-than-professional" appearance. Selling yourself and your skills can never start too early. John Malloy proved it in his "Dress for Success" experiments, and the same is as true of a professional's tools of the trade as it is for his clothes.