Failing that there is always retail/food service/etc, but working on campus has a lot to recommend it over these other options. It pays better, is more convenient, has more potential to result in something with resume power, etc.
My advice is to have fun hacking away at as many little projects as possible. Maybe one will get someone else's attention who is in a position to help you out (like what happened with me, but I already am employed by the university). Or maybe you can figure out how to capitalize on one of your little projects. If all else fails you're always building your resume for when you apply around.
Research: degree of pay varies widely. Our math department offers $12k for a year's worth of undergraduate research. I'd assume yours has something similar.
Private sector: Last I was getting $18/hr for JSP work, but I found the Wash. DC IT scene to be relatively soul-crushing. Also risks interfering with your studies because in most cases it drags you off campus.
If you're really hungry for cash, sell some stuff from home on Amazon.
Under market consulting rates, above typical college rates, I walked to the office and set my own hours. Everyone wins. It was hard to beat.
Also, my dorm room happened to be right next to the building I worked in.