Apple MacBook Pro Retina 15" (256GB SSD, Intel Core i7 4th Gen., 2.20 GHz, 16GB) Laptop - Silver - MGXA2LL/A (Mid 2014) for sale online | eBay
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Amazon.com: PCIe NVMe Gen3x4 SSD 1TB 512GB 256GB 128GB 3D TLC NAND Flash Hard Drive SSD Replacement for Macbook Air 2013-2017, Macbook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
Upgrade Macbook Pro 15″ 2014 SSD To NVMe—Part 2: The Upgrade
MacBook Pro 13" Retina 512GB Blade SSD Solid State Drive, Late 2013 / Mid 2014 - 661-8139