Amazon.com: OWC 1TB Aura N2 NVMe SSD Upgrade Kit w/Envoy Pro Enclosure Compatible with MacBook Pro w/Retina Display (Late 2013 - Mid 2015) and MacBook Air (Mid 2013 -Mid 2017) : Electronics
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
Upgrade SSD on Mid-2015 15" Retina. Which SSD? | MacRumors Forums