Amazon could soon be diversifying its growing retail empire to target the kinds of things people frequently buy at warehouse club stores as part of a new Pantry service that will launch next year. Citing sources, USA Today says Amazons in the midst of planning a service that will offer around 2,000 items people typically buy at shopping clubs like Costco and Sams Club. This includes cleaning supplies, kitchen paper rolls, canned goods like pet food, dry grocery items like cereal and some beverages, USA Today says. Some of these items are expensive to ship, but Amazon might have figured out a way to solve that.