street cannabis can run between $ 8 00 and $ 15 00 per gram 1 ounce 28 3495231 grams so if you were to take private organic cannabis at $ 10 a gram one ounce would cost just a few cents under three hundred $ 280 00 usd dollars i hope this answers your question on what is the cost of medical marijuanall prices are per gram these are medical marijuana cost i have added street value for private organic cannabis $ 10 per gram for government non organic cannabis $ 15 00 per gram