Where can I buy this car? Easy ten points answer quick!?

OK. I'm thirteen and ill be fourteen next month. I am thinking about what kind of car I want to drive not as my first but after a little while. I want a 1970 Plymouth Barracuda (convertible). I don't want to spend more than 5,000 dollars and I want a crappy unrestored one as I project car. Where can I buy this and if you tell me how to pick a best answer then I certainly will. I'm pretty new on here.