Where can I get insurance for training in a small yoga studio? The owner said it shouldn't cost more than $200/yr. for great coverage. but she didn't tell me where to find it!

group liability insurance at a very reasonable rate is available through a number of professional industry associations.  In most cases you need to be a member of the organization to take advantage of the low group rate they have secured.  A few organization to check with include IDEA, The Pilates Method Alliance and Yoga Alliance.   You mention a small yoga studio so you may already be involved with the Yoga Alliance.

 Here is a resource for you as long as you have a certification.  Several of the teachers who have gone through my PPS education have used this company and are happy with it.  K & K Insurance  800-506-4856.  Good Luck!