QuilterJ, I, too, have flat feet. I have used off the shelf orthotics in the past, but am now wearing an old pair of Nike running shoes with no orthotics and the original insert taken out. They're ugly, but my feet hurt less in them.
Now I have to add to this post that I also have an inherited neuropathy and arthritis in my right foot. I don't think there is an orthotic out there that can fully relieve my foot pain.