Putting its partnership with mobile payment startup Square to work, Starbucks announced today that it has begun selling Square Mobile Card Readers in its 7,000 stores across the US.

Available for $10 with a $10 rebate for new users, Square says its mobile reader is now available in over 30,000 retail stores across the US, which include Apple Stores, Best Buy and Walmart.

The availability of readers in Starbucks stores comes after Starbucks signed a $25 million payment deal with Square, an agreement that sees it handle all credit card transactions for the coffee giant. Starbucks was one major backer in Square’s Series D financing round — which valued it at $3.75 billion — which also saw Starbucks chairman, president and CEO Howard Schultz join the company’s Board of Directors.

Square’s first Starbucks rollout came in November, but it isn’t expected to be limited to the US. Square has already expanded its services into Canada and is expected to come to Europe later in 2013.

The company entered the new year with more than $341 million in total funding, processing $10 billion annually.

Image Credit: Brian Wilkins/Flickr