Samsung 512GB SSD Apple Macbook Pro Air 2013 2014 2015 A1502 A1398 A1466 A1465 | eBay
MacBook Pro 13" and 15" Retina (Late 2013-Mid 2014) SSD
Amazon.com: Sinobright Original 128GB PCI-e SSD Replacement for MacBook Pro Late 2013 - Mid 2014, MacBook Air Mid 2013 - Early 2014, iMac Late 2013 - Mid 2015, Mac Mini Late 2014 (Bulk, No Retail Packaging) : Electronics
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET
Amazon.com: JESOT NGFF M.2 NVMe SSD Convert Adapter Card for Upgrade MacBook Air 2013 2014 2015 2016 2017 and Mac Pro Retina 2013 2014 2015, NVMe AHCI SSD Upgraded Kit for A1465 A1466 A1398 A1502 : Electronics
Amazon.com: Fledging 1TB Feather M13-S PCIe NVMe Gen 3.0x4 SSD Upgrade – DIY kit & OS Included – Compatible with Apple MacBook Air (2013-2015) & Pro (2013-2016), Mac Mini (2013) & Pro (2014), iMac (2013-2019) : Electronics