MacBook Pro 15" Retina Display Early 2013 SSD Replacement - iFixit Repair Guide
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
Amazon.com: Odyson - 512GB SSD Replacement for MacBook Pro 13" A1425 (Late 2012, Early 2013), 15" A1398 (Mid 2012, Early 2013) : Electronics
MacBook Pro 15" Retina Display Early 2013 SSD Replacement - iFixit Repair Guide
SSUAX SSD For Late 2013 / Early 2014 MacBook Pro Retina