Convenience stores and liquor stores run one of the highest-SKU, lowest-margin purchasing operations in retail — 3,000 to 8,000 SKUs in a c-store, often more in a liquor store — supplied through a vendor structure unlike anything else: one or two big wholesale distributors for the core of the store, a parade of DSD (direct store delivery) vendors who walk in with the order already decided, cash-and-carry runs to fill the gaps, and, for alcohol, a state-regulated three-tier system that dictates who you're even allowed to buy from.
This guide explains how the whole ordering system works, where each vendor type's quirks bite, and why the standard POS-plus-memory setup leaks margin at this SKU count.
The four vendor types (and who's really deciding)
The broadline c-store wholesaler. One or two large distributors (McLane and Core-Mark are the national names; strong regional houses everywhere) supply the center of the store: packaged snacks, candy, grocery, tobacco, health and beauty, foodservice supplies. Weekly or twice-weekly delivery, ordered through the distributor's portal or a handheld scan-and-order routine, against your item authorization list and contracted pricing.
DSD vendors. Beer, soda, chips, bread, dairy, ice cream — delivered directly by the brand's or bottler's route driver, who often writes the order themselves based on shelf space and their own targets. DSD is convenient and it is also the place where your ordering decisions quietly stop being yours: the driver's suggested order optimizes their route and quota, not your cash. Stores that check DSD orders against their own sales data consistently carry less dead stock.
Alcohol under the three-tier system. In most states, liquor and wine must be purchased from licensed wholesalers — not direct from producers, not from other retailers, and (depending on the state) sometimes only from the state itself. Practical consequences: allocated products you can't just reorder, quantity deals and post-offs that reward buying deep at the right moment, delivery-day and payment-term rules set by regulation (some states require COD or tight terms by law), and per-state paperwork. The buying skill in a liquor store is timing purchases against the deal calendar without drowning in inventory.