Check and see if your school has any student positions in their marketing department or if housing or student life has student designer jobs. I work in the student life department at my school and it's great because it's an hourly job, my boss is a great mentor, and I get work experience in a studio environment. If that's not an option, talk to your professors and see if they have any connections or opportunities they can direct you towards. I got a pretty good contract job that way.