Staples will start selling the Amazon Kindle at its stores starting this Sunday, the office supplies company announced today. Staples said that its stores will have the Kindle and Kindle 3G for $139 and $189, respectively. The company will be selling the 9.7-inch Kindle DX for $379 starting in mid-November. In addition, Staples will be selling a variety of Kindle accessories, but it didn't say exactly what would be available. Staples is joining a growing number of brick-and-mortar retailers selling Amazon's Kindle, including Best Buy and Target. For more on this story, read Staples to sell Kindle starting Sunday on CNET News.