MacBook Pro Retina (Mid 2012): SSD Replacement - YouTube
Amazon.com: GODSHARK 7+17 pin mSATA to A1398 A1425 (2012 & Early 2013) Adapter for MacBook Pro Retina SSD Replacement, Mini PCIe SATA SSD Converter Card : Electronics
Amazon.com: Transcend 960GB JetDrive 720 SATAIII 6Gb/s Solid State Drive Upgrade Kit for MacBook Pro 13" with Retina Display, Late 2012 - Early 2013 (TS960GJDM720) : Electronics
MacBook Pro Retina: Upgrading to SSD (Howto)
NEW Apple SSD Upgrade 1TB For MacBook Pro Retina 13" 15" 2012 2013 A1425 A1398 | eBay
Amazon.com: Odyson - 768GB SSD Replacement for MacBook Pro 13" A1425 & 15" A1398 (2012, Early 2013) : Electronics
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
Amazon.com: Sintech M2(NGFF) SATA SSD Card,for Upgrade 24Pin 2012 Year MacBook PRO Retina SSD (Fit M.2 SATA 2280 SSD,Not Fit M.2 nVME SSD) : Electronics