communal purchase
n. The purchase of a large quantity of a single item by aggregating individual buyers.

Example Citation:
"Here's how the new world of communal purchasing works: You place an order for a Palm V, say, and give Accompany 72 hours to assemble a group of buyers. Accompany will bundle you with other Palm V seekers—25, 100, 500 at a time—and negotiate a purchase in bulk, so you can share in the kinds of stepped discounts usually reserved for larger corporate buyers."
—Chip Bayers, "Why Buy Retail?," Wired

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