I purchased some off of Amazon (Solaray 400mg 100caps for about $9) a couple of years ago when I was dealing with some extremely painful impingement issues from my lower back down my butt. My issues resolved themselves before I really could evaluate it's effectiveness.
One problem that I have with Nsaid pain relievers is that some, such as ibuprofen, tend to elevate my blood pressure, so any non-narcotic alternatives are always of interest to me.