Purchasing components for radio controller

I've been working on the desing of my land speed RC car project, and I
am having difficulty finding components for the RC transmitter.

The parts I am talking about are the simple analog sticks (2 way), and
some sliding pots like those used for as a trim.  I could just use a
standard pot with a knob on it for the trim, but I feel the sliders
give me quicker visual feedback as to where they are at.  I could just
take apart an old transmitter, but I wanted to use new parts if
available.

What I plan on doing is having a single sliding pot that will control
the throttle.  I have heard of a cruise control feature for the
throttle.  Haven't used it before, but it sounds nice.  The idea is
that I can slowly give it throttle as the car accelerates without
having to always hold a stick in the right position.  Also, a steering
stick that only needs to move left and right, and another stick  that
will control the brakes.  Then I will have the misc. switches for my
panic buttons, parachute, and ignition kill.

Anyone have a source where I can buy some of these things,
particularly the standard RC sticks (with pots), and slide trimmers?

Thanks.