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!
mSATA SSD Installation with an adapter on Macbook Pro 15 (Retina Mid 2012) - YouTube
How to install an SSD on a 15-inch Retina MacBook Pro
256GB SSD For 2012 & 2013 Apple MacBook Pro Retina - A1425 / A1398
OWC SSD Kits For MacBook Pro Retina Display 2012 - 2013
New 2.5" SSD won't fit - my MacBook pro says it's a mid 2012 15" model - Ask Different
MacBook Pro Retina (Mid 2012): SSD Replacement - YouTube
How to Upgrade MacBook Pro Hard Drive (Unibody, 2009-2012): EveryMac.com
Does the mid-2012 13 MacBook Pro have an M.2 slot that I can use for an Intel Optane memory upgrade? - Quora
MacBook Pro 13" Retina Display Late 2012 SSD Replacement - iFixit Repair Guide
128GB SSD For MacBook Pro A1398 Mid 2012 Early 2013 A1425 Late 2012 Early 2013 | eBay
How to upgrade a Mid-2012 Macbook Pro to SSD | David Artiss