Amazon.com: 512GB SSD Hard Drive for Apple MacBook Pro Air 11" 13" 15" A1502 A1398 A1465 A1466 (Late 2013-2015) / OSX Sierra/Mac Pro A1481 : Electronics
SSD in the new MacBook Pro with Touch Bar can't be upgraded
How to Upgrade MacBook Pro SSD Storage (Touch Bar, 2016-2020): EveryMac.com
Amazon.com: MCE Technologies 1TB Internal SSD Flash Upgrade for MacBook Pro Retina (Mid 2012 - Early 2013) - Includes USB 3.0 Enclosure for Original Drive & Install Kit! : Electronics
RAM upgrade and/or SSD drive – what's the benefit?
OWC SSD Kits For MacBook Pro Retina Display 2012 - 2013