Interestingly enough some foot supports were shown on Dragons Den recently. The person walked over the screen and showed the deformed regions where support was necessary. They decided not to back it when the price of �500 for the shoe inserts was mentioned.
I have had plantar fascitis for a number of months and a partial cure was obtained by buying a shoe insert with extra support for the instep, cost �9. The tendon under the foot causes the problem. I will try to dig out the advert.