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
How to Upgrade Retina MacBook Pro SSD Storage: 15-Inch: EveryMac.com
Amazon.com: Odyson - 128GB SSD Replacement for MacBook Pro 13" Retina A1502, 15" A1398 (Late 2013, Mid 2014) : Electronics
Apple MacBook Pro Retina 15" (256GB SSD, Intel Core i7 4th Gen., 2.20 GHz, 16GB) Laptop - Silver - MGXA2LL/A (Mid 2014) for sale online | eBay
How to install an SSD on a 15-inch Retina MacBook Pro
Amazon.com: OWC 1.0TB Aura Pro X2 SSD Compatible with MacBook Air (Mid 2013-2017), and MacBook Pro (Retina, Late 2013 - Mid 2015), and Mac Mini (Late 2014) : Electronics
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) SSD
Late 2013-2014 Macbook Pro Retina SSD Upgrade Notes - YouTube
How to Upgrade the SSD Storage on a MacBook Pro Retina 2013/2014/2015 | Replacement Guide - YouTube
How to use an NVMe drive to upgrade your Mac's SSD | AppleInsider
15” Macbook Pro Retina A1398 - PCIe SSD Flash 512GB Storage Late 2013 2014 2015 | eBay