You can purchase the yoga trapeze by YogaBody.com! They are running a 30-day free trial to see if you like it. I personally have the pre stages of arthritis and degenerative disc in my Cervical Column. This inversion therapy alleviates my pain with zero gravity!
As part of therapy for PTSD and depression, I exercise and have a nutritional program. Yoga is a good way of letting go and meditating.