Chicago North

I've Been Offered An Internship In Downtown Chicago And Need To Find A Place To Live. I Am Looking To Stay North Of Downtown. Wondering If Any Knows Of Inexpensive Summer Housing. I've Tried Looking On Roommates Websites, But Can't Seem To Find Anything Reasonable In My Price Range. Looking At Max Of $500/month. I Know That Limits Me, But That's What I Have To Work With.