Where can I find dirt cheap junk cars that run and drive?

-Okay I'm 14 and wanting a dirt cheap junk car that I can race around my property. But I do not know where to look, I'm thinking of smaller foreign cheap car. that I can disconnect air bags on cut mufflers ect whatever I want. I have a 72' beetle and a Ford truck but they are going to be my main car and back up car when I'm ready to drive