The BEST pillow for Class
The pillow that I use for class is the
"GO ANYWHERE PILLOW". 
It is perfect for our class because it can be molded to different shapes to fit perfectly for supporting the neck, hip or shoulders.
Therabands
These Stretchy straps are what is recommended for Essentrics.  They come in different resistance levels.  I like the green.  To get yours, you can find them at Amazon.com or contact me, if you are a regular client, I'll be happy to send you one.
Node Fitness
Premium Yoga Brick
I find them at Amazon.com
Medline Invalid Ring cushions
I find this brand to be the best for fitness.  The foam is very firm and the bottom is flat so it won't slip out from under you.