Ok doing a pole building bulding on a pretty steep grade. The building is up and is ready for fill. I need 28" of fill in the back to 6" in front. My plan was goetech, then 57's then cr6. I figured about 60 tons of stone to get where I need to be but the customer doesnt want to pay for it.($500 a load) They want to use fill dirt but I told them by the time I tamp it will cost more in labor. Is there a cheaper alternative to 57's for good fill base.?