How about free?
Linkyi suspect these folks make their money on custom aircraft additions and or selling the interface cables for standard FM R/C transmitters so they can be used in place of Joystick controllers.
The hard part in learning R/C is defeating control reversal.. simulator time defeats this, and you don't need a 'real' RC Transmitter to overcome control reversal, so your normal joystick oughta work just fine.
haven't tried this one out.. lemme know if you like it.