I costed out an ounce of ak-47. Considering the light and the soil were already paid for. The last run I had cost me roughly 3.75$ (USD) per ounce. My time is roughly 15$ per hour. That was not factored in. Electric was. (Figure at least 40 real hrs per grow minimum) per grow divided by ounces. Because to me, it is a labor of love, and my bud is not for sale. Smoking bud you have grown is PRICELESS IMHO. I chose to cut out the middle man. If I am smoking crappy herb there is no one to blame but myself.