MacBook Pro (Retina, 13-inch, Early 2015) Upgrade to NVMe M.2 SSD - YouTube
How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac
Amazon.com: Sintech USB 3.2 Type C External Case, Compatible for 28Pin SSD from MacBook Air(Mid 2013-2016) and MacBook PRO(Late 2013 - Mid 2015),Support nVME SSD if with M.2 Card ST-NGFF2013 : Electronics
MBP Early 2015 13" SSD Upgrade, does it boost the device speed? | MacRumors Forums