Amazon.com: Odyson - 768GB SSD Replacement for Apple MacBook Pro 13" A1425 & 15" A1398 (2012, Early 2013) : Electronics
MacBook Pro 13" Retina Display Late 2012 SSD Replacement - iFixit Repair Guide
Upgrade option for Mid-2012 Macbook Pro Retina SSD | MacRumors Forums
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
Samsung OEM SSD for Mid 2012 and Early 2013 MacBook Pro Retina
NEW Apple SSD Upgrade 2TB For MacBook Pro Retina 13" 15" 2012 2013 A1425 A1398 | eBay
Upgrade option for Mid-2012 Macbook Pro Retina SSD | MacRumors Forums