Your best bet might be to find one via a colleague.
Update for anyone in additional to @enderland who doesn't understand the "why" or the "how" of this answer...
Why? Because most recruiters are a lot like used car salesmen. With experience, you will learn this. Your colleagues have likely interacted with recruiters, and it's possible that some of them have had a rare, good experience with someone. This is much more reliable than looking at ads in magazines, etc. There is no www.ethicalrecruiterswhoreallycareaboutyou.com
How? Simply ask your colleagues. "Hey Sally, can you recommend any good recruiters?"