Sale items and loss leaders can be purchased in bulk. Special orders can be placed with store managers as soon as sale flyers come out. It helps to be a regular customer. It also helps to be nice when the manager has to decline (sometimes managers have limited stock is available to them). Unadvertised specials are also good times to ask about a bulk purchase. The store may be overstocked on a particular item (usually meat or produce) and the manager might be willing to work out a lower price/unit if you're willing to take a large amount.