From a former liscence suspendee (under rather similar circumstances, I plunked down 120 to drive again, all for failing to stop at a stop sign), I'd have to go with the on campus job. They're flexible, understanding that school comes first, and usually pretty light work.
The best ones are the jobs with a computer so you can post to GC while getting paid.
If not, does the local greek store have any posistions open? I know our store, University Rho :: obligatory groan:: is always looking for more people. Try applying somewhere like that if you can, and you'll not only make some quick cash, but will also get a discount on greek stuff.