Blame it on Arabica. Starbucks will raise its U.S. cafe and store prices after drought in Brazil pushed up the cost of coffee. Starting June 24, the cafe's prices will rise less than 1%, while the price for Starbucks-branded ground and whole-bean coffees sold in grocery, drug and mass retail stores will increase by about 8%, on average, per Zack Hutson, a Starbucks spokesperson. Dunkin’ Brands Group Inc., also said it was mulling a modest price increase.