Amazon.com is working on a new business called Pantry that will help it expand further into the giant consumer package goods market and versus warehouse club stores Costco and Wal-Mart's Sam's Club, according to sources. Pantry, which is run by Billy Hegeman, a senior manager in vendor management and consumables at Amazon, is currently set to launch in 2014, the people said on condition of anonymity. They did not want to be identified because Amazon's plans are still private.