Most superproducers charge around 100,000 or more...Dre is 250, and I know Neptunes, Timbaland, Kanye, DJ Quik, maybe Just Blaze are all 100,000.
However....I know first hand that most artists you see on TV will never pay 100,000 straight up for a beat unless they are brand new and workin on a major company budget. Most of these producers work hella deals, which is why you'll see them on each other's projects....like Kanye will give Game a beat for half price or even less, but then say "you gotta do a verse or whole song on my album". Dre always works deals like that, and a lot of times it is for his ghostwriters, or either for artists who he'll get to be on one of his artist's albums.