I'm not sure how many hours are you trying to work a week. My friends work on campus, they only work 12 hours a week, and make roughly $400 a month after tax and such. It's not really working either, it's more like hanging out on campus and doing a few errands every now and then. The downfall is that you can only work low hours. If you want to work 20+ hours, you would have to get a retail job of some sort, not much opening to a college student I think.
I'm countin' those M's now/ Those O's come straight off the Benz now...not the 550, more like the 65/