i paid about 150 a double axle. Which is roughly the price you pay to deliver anything, not including material. So the cost of trucking is the only cost.Yeah that stuff is pretty popular around here. And I don't think it is free (excluding delivery and installation) which is kind of annoying. Another good one is crushed bedrock. All of the little pieces lock together and don't allow water to tear a deep groove in it. That's the problem I am having now with just regular gravel. Enough of a slope for water to catch speed and erode the driveway.
The best way to avoid water erosion is to have a proper hump to the road too, about 4 degrees if i aremember right.