Edmunds states invoice is 18900 for 2003.5 and 18400 for 2003.
Your best bet is to travel to a different state because it seems as if some dealerships are more willing to get rid of them. My area has tons of them and they dont seem to be selling them that fast yet they are assholes on the price, one guy told me invoice was 21,200....I laughed in his face and threw my taco at him.
Mike