Out of the name brand dirt bikes like KTM,kawasaki,Yamaha,suzuki,hon... which one is the cheapest?

I have a dirtbike its a play around kind of dirtbike. I want to start racing motocross, i have been looking at baja motorbikes but none of them could sustain jumps and have the right acceleration.I would like a good name brand but even the used ones are like 1 thousand 2 thousand. Does anyone know of a website or... show more I have a dirtbike its a play around kind of dirtbike. I want to start racing motocross, i have been looking at baja motorbikes but none of them could sustain jumps and have the right acceleration.I would like a good name brand but even the used ones are like 1 thousand 2 thousand. Does anyone know of a website or even have one themselves trying to sell that is 700 dollars or under. Don't say ebay or craigslist,already know about them
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