Star wars LEGO HELP!?

Hi! I need to know where I can get another clone trooper helmet for my LEGO clone trooper minifigure. I have the republic gunship LEGO set and my neighbor from my old house won't admit he stole it because he never had a clone trooper helmet then one day he had one. So I need a knew one. Does anyone know where I can get one for a very low price? I don't want the new LEGO clone trooper helmets because the look GAY!