Water Bottles & Drugs
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What I've seen more down here, are junkies hanging around the grocery stores in the poorer part of town. Guys (or gals) will hand them a shopping list in the parking lot, after the cash is agreed upon. The usual cut is about 50%. The junkie buys the groceries, pushes their cart out to the parking lot and exchanges the groceries for the cash.
Many of these guys have "regulars", so after a time or two, the buyer knows how much he can spend and what he can buy at a predetermined rate. The junkie knows his customer and rate, so the there is an element of trust and it's a smooth transaction.