I had my fitting done at Signature. They use the Serrota Fit Cycle method. The whole process took a little over 3 hours. I bought a custom built bike from them. The cost of the fitting was included in the cost of the bike. If you don't buy a bike from them they can make recommendations on bringing your existing bike closer to your body geometry, or recommend a brand that will come close. Another name I have seen recommended is Mike Sherry of Performance Labs. He's located on the UWS.