if you want dirt just get the phonebook out and look up excavators and builders. and pool companies. even a local quarry. my local quarry charges under 10 bucks a tonne for builders rumble, crushed sandstone and unclean fill. but the delivery is $80, but the trucks can hold like 15 t. if your serious about it do it that way and dingos/kangas are 300 a day where i am. gota spend some money but if you can spare it its so worth it... im a carpenter apprentice and when we do excavations i get the boys to dump all the dirt at my friends place and use it for jumps and berms.