I used to suggest that any school that wouldn't let a student try it for free might be in it more for the money... Unfortunately, the modern age of insurance requirements has changed this. Under the insurance policy that we have where I teach, you wouldn't be covered until you were formally signed up and paid... It's awkward, and I'm glad my partner handles the money side of things, but it's a reality. You're welcome to observe the class...but we can't risk a litigous sort getting hurt and not being covered, either!