Upgrade SSD on Mid-2015 15" Retina. Which SSD? | MacRumors Forums
Amazon.com: OWC 2.0TB Aura Pro X2 Complete SSD Upgrade Solution with Tools & OWC Envoy Pro Enclosure Compatible with MacBook Air (Mid 2013-2017) and MacBook Pro (Retina, Late 2013 - Mid 2015) : Electronics
How to install an SSD on a 15-inch Retina MacBook Pro
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 the SSD in a 2015 MacBook Pro 15" - Bigger! Better! - YouTube
How to install an SSD on a 15-inch Retina MacBook Pro
How to use an NVMe drive to upgrade your Mac's SSD | AppleInsider