There are cheaper one, but are there better ones?
I have tried several seat cushion solutions for relieving sciatic pain and this is by far the best.  The alternatives are not even in the same league.  Are there cheaper alternatives?  Yes.  Are they equal and better than this cushion.  Not in my experience but certainly I am limited in experience to the handful that I have purchased.  This has held up very well to constant and daily use.
Rating: 5 stars