Look Out Costco: Groupon's Got Bulk Goods By: Benzinga via Benzinga May 02, 2014 at 10:49 AM EDT Expanding its e-commerce portal to include bulk quantities of more than 100 items, Groupon (NASDAQ: GRPN) has taken on Costco ... Read More >> Related Stocks: Amazon.com Costco Wholesale Groupon Cl A Wal-Mart Stores, Inc.