Hi Judy: I have purchased three Gypsy Sit Upon. I gave one as a gift to my quilting teacher and she loves it. I use my in the car and when I am quilting, I also sold one to a friend who quilts. It is great in the car, my back doesn't hurt and it helps me sit up straighter. It was recommended to me by a quilter who did a show in San Francisco and sat on it for more than eight hours and wasn't aching at all. You can get it in your local quilt shop for $29.95 plus tax or go on Amazon and get it for the same price no cost for shipping.
I purchased it this spring. I know you will enjoy it, but it will take getting use to. It make your core help you sit up straight.
Tomo