I average $100 per grow with soil cost I mix in extra perlite but man has that gotten crazy expensive more than the same soil as far as increase in cost I estimate with electricity and nutrients 5-$600 each grow on average. $500 for a pound is still a good deal the way I smoke. I bought a couple of ounces to hold me over but I ripped through them like 1/2 ounce a week I could smoke $500 worth in a month haven’t learned pacing myself yet