Sports Collectibles carries all the Boston Celtics memorabilia. Support your Boston Celtics with these Celtics collectibles and memorabilia. Our best-selling items are Boston Celtics photo mints, autographed basketballs, jerseys and autographed photos. Our Boston Celtics items are officially licensed by the NBA. All autographed Celtics items come with a Certificate of certified authenticity and matching hologram to ensure certified authenticity.