Honestly craigslist is the best place to look (at least where I live). State Bar websites often have job postings as well, so that may be a good place to look.
Your question is a bit too broad. Care to share any details about what you'd like to do (Runner, receptionist, secretary, legal secretary, full paralegal?) What size of firm?
I would suggest you target the same type of place you'd like to practice law in. For example, if you'd like to work as an associate for a firm with more than 100 attorneys, then it probably won't help you very much if you are a secretary in the victims assistance department at your local DAs office.