At various times I have poked around on the internet just to look this up. Give or take 20%, below are the two that I recall. Also, if one wants to get real technical, rhino should be removed from the list. It was originally the black rhino as it was quite aggressive. They are near extencation and you can't hunt them. The white rhino isn't a proper substitue (at least that's what Jeff Cooper wrote) since it isn't nearly as aggressive. Also, hippo wasn't on the orignial big 5 (though Cooper thought it would make a great dangerous game if hunted on land and you were between it and the water hole). You are missing the African buffalo/water buffalo (I forget it's proper name).
Elephant $100,000
Lion $70,000