Look for hybrid gig that combine law and business. In-house counsel internships and IP shops are good for this. I worked this summer for the lab that invented priceline.com doing IP and entrepreneurial business research and summary writing.Paid $650 a week ... barely enough to cover my bills, gas and incidentals but not bad either. As someone mentioned, often times smaller to mid-sized firms will pay for "law clerks" which means you do as much grunt work/organizing of files and putting them together/mailings/related tasks as you do real writing, research and motion work. Also, check with your school regarding its clinics ... several of my friends got clinic jobs for the summer that paid $10 to $15 an hour. Yeah, it's not glamorous and some of the uppity jackovs on this board would look down their nose at such a thing, but those folks are getting GREAT practicial experience, attending court hearings, meeting with clients, lots of memo writing etc.
Will say this, though: I've learned the *best* internships after 1L are the unpaid ones.