door buster
n.— «Retailers such as Wal-Mart and Sears, Roebuck opened at 6am yesterday to promote their “early bird” specials, also known as “door-buster” sales.» —“Stores open doors to bargain hunters” by Lauren Foster in New York City Financial Times (U.K.) Nov. 27, 2004. (source: Double-Tongued Dictionary)