MacBook Air 13" Early 2015 SSD Replacement - iFixit Repair Guide
How to Upgrade the PCIe SSD in a 13-inch MacBook Pro w/ Retina display (Late 2013 - Early 2015) - YouTube
MacBook Air 11"/13" (A1465/A1466) and Pro Retina 13"/15" SSD
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Amazon.com: Odyson - 256GB SSD Replacement for Apple MacBook Pro 13" Retina A1502 (Early 2015), 15" A1398 (Mid 2015) : Electronics
MacBook Pro 13" and 15" Retina (2015) SSD
Amazon.com: MCE Technologies 500GB Internal SSD Flash Upgrade for 13" and 15" MacBook Pro with Retina Display (Mid 2012 - Early 2013) - Includes Installation Kit! : Electronics