Here's a link to a type that PT's make:

http://www.sidas.com/

They're custom made and go into cycling shoes. I am getting some this month as a matter of fact. I wore/wear them in running shoes and my feet are pretty messed up in general so I figure it'll help having them in my cycling shoes. I bet if you look, you can find a PT in your area (or a podiatrist or orthopedic person) who does these