Get an ounce and sell grams. That's what i do and i keep my self in weed 24/7. Sell 20 grams and smoke 8. Sell em all and that's enough to get another oz + some extra cash etc etc. Works quite well if you can sell em good. A shit load of people always came to me to get em a sack cuz they didn't know any dealers so now this is what i do