The Trio Folks will sell you just the servos
I spoke to the Trio folks at OSH last year and they recommended that I install the servo before closing out the wing. They offered to sell me just the servo and I could purchase the rest later. I was a little leary, but then he said I would get a money back guarantee, and that I could return it for a full refund, even if I did not like the color. He even put that in writing. I was sold. I have since purchased another servo for the pitch autopilot. These folks are great to deal with.
Stone Mountain, GA
YIO-360 180 hp Lycoming
Hartzell Blended Airfoil Prop