I don't know who you are certified through but STOTT Pilates allows its certified professionals to post ads on their website. Too if you are ACE Certified you can utilize the services go Gym Job.
I'm right there with you. I've grown a studio and I'm looking for classically trained pilates instructors. I'll help them grow their training to a comprehensive level via our education repayment program as well. I'm located in MI.
I highly suggest posting on craigslist as often as you can. You'll be surprised how many people will be looking for your services!