1999 VW Passat V6 2.8L

I need a Throttle Positioning sensor, or a throttle vavle for my 99 VW Passat V6 2.8L Non turbo does anyone know where to find one? and aroung how much they cost

may i ask why u need one because if u do tps is sold as one unit throttle body with the tps on it and is about 1100 from dealer