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
Replace your 2009-2012 MacBook Pro HD with an SSD
MacBook Pro 13" Retina Display Late 2012 SSD Replacement - iFixit Repair Guide
Upgrading SSD on Macbook Pro Late 2013 - Ask Different
How-To: Upgrade the SSD in your MacBook Air or Retina MacBook Pro, boosting size & speed - 9to5Mac