I'm with Kingston for a change
. Check out the school. Look at the quality of its students. Even if they are good, keep in mind that throwing in boxing, BJJ, gung fu, karate does not a good self defense school make. Look at the guest instructors that have come in recently. Check up on them. If it's a bunch of karate guys, keep on looking. A good self-defense school is hard to find, and usually isn't dirt cheap (like this school). Be openminded, but be very critical of what you see--make sure it's the real deal.