Flap cable running from control to flap motor

[Rickskymaster]

I am just finishing up this years's annual and need a new flap cable, the one that runs from the flap lever to the flap motor, at the back of cabin.
If anyone can tell me a good place to get one and the approximate cost to change it out.
In looking at the parts manual and seeing how it runs to the back of the plane, I am anticipating an considerable ordeal.
Any suggustions would be greatly appreciated.
Rick