there is ample information for patients that is available and is actually evidence-based in the public domain - ie free. There is no need for them to spend money on commercial packages written by an author who is there to make money unless patients choose to do so. My understanding of this site is that we provide sound evidence in our advice where such evidence is available. In the case of low back pain with or without sciatica such information is available and it isn't necessary to purchase products based some unsubstantiated pet opinion about what is best.