Starbucks expanding its retail arm to sell Square credit card readers

in what appears to be Starbucks' first foray into the retail technology space, the coffee chain will start selling Square mobile card readers at its 7,000 U.S. stores. The card readers will cost $10 each, with a $10 rebate available for new users of the service. And while it may seem odd that the coffee chain now offers a tech device along with muffins and bean juice, Starbucks invested $25 million in Square just last year, along with the company's CEO, Howard Schultz, joining the Square board of directors, so this attempt at synergy was something to be expected.