What other websites beside Craigslist sells used cars? *read detail*?

Im a student in need of a reliable car...ive been told to look for toyotas and hondas only....so i went on craigs and some prices are way out there for cars with over 170miles!!! I have about $3200 set aside for a car...should i just save it and start to build credit ( i dont have any...im only 20) to buy a new/used certified car? Or do i get a cheap crappy car for udner 2500?

What other websites are ther? I know of autotrader and automart....does ebay sell cars?
****any tips on starting credit is a plus!!!! Links are an even bigger plus!!!