Not content to grow just its cafe business, Starbucks (NASDAQ: SBUX ) is now making a concerted push in grocery stores. The company announced a 10% decrease in its packaged coffee prices, and starting in May, those packages will allow customers to earn credit toward their Starbucks loyalty memberships. The price decrease reflects both the increased competition for customers and a drop in coffee bean prices. Starbucks last increased prices in 2011, and this price cut should bring them back in line with the pre-hike levels....