Amazon.com: 512GB SSD Hard Drive for Apple MacBook Pro Air 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013-2015) / OSX Sierra/Mac Pro A1481 : Electronics
MacBook Pro (Retina, 13-inch, Early 2015) NVMe M.2 SSD Upgrade Speedtest - YouTube
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Upgrading a 2015 MacBook Pro Retina with the 2TB OWC Aura Pro X2 SSD upgrade kit