How to install an SSD on a 15-inch Retina MacBook Pro
Apple MacBook Pro Mid 2012 - 15-inch 2.3GHz Core i7 Apple Memory/RAM & SSD Upgrades | Kingston
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
NEW 1TB SSD For MacBook Pro A1398 Mid 2012 Early 2013 A1425 Late 2012 Early 2013 EUR 129,30 - PicClick IT
How to upgrade a Mid-2012 Macbook Pro to SSD | David Artiss