Amazon.com: 256GB SSD Hard Drive for Apple MacBook Pro Air 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013-2015) / OSX Sierra/Mac Pro A1481 : Electronics
Apple Macbook Pro Retina 13 512GB SSD Hard Drive for A1502 Late 2013 2014 2015 | eBay
How to install an SSD on a 15-inch Retina MacBook Pro