I find it just as cheap to buy in crush from local firms - it's all a consistent size and type, often similar price to paying haulage on "free" product, is no longer classified as waste, and the speed it arrives can be adjusted to suit the progress on site each day to ensure it's tipped where it will be used and isn't double handled.
"Free" product can turn out as expensive, or more so than paying for it if you aren't careful.
Best of luck though.