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.