Orrrrrrr you can just cop in large amounts, sell little bags only to people you fukk with, and before you know it you're smoking for free and making a tiny profit on the side
Pretty much this.
I normally front for a partner of mine who buys in bulk, cuts me two ounces, makes profit, pays me back the money I fronted him and something extra.
I used to give that shyt away or sell in small amounts but after peeping how economic (and safer) it is to just sell in bulk, I used to just sell the ounce and make bank from one big haul. I started smoking the shyt myself now so I just whatever he gives me for myself so I don't got to go out and look for an ounce my damned self when things get dry around here. fukk that nickle and dime shyt.

The key is to grow out of that when you can and start selling/buying in feasible quantities to sustain (Smoke) or benefit (Sell) you.