Wonder-gel cushion
I don't know why I didn't buy this sooner.  Because Amazon has a good reimbursement rate, I decided to see if it was what it said it was.  As a result, I carry this cushion with me everywhere I go.  I have had little or no back pain since I got it.  I am not saying that this is the answer to your back pain, but it is worth the try.
Rating: 5 stars