Used Apple MacBook Pro A1502, 13-inch Retina mid 2015 with Intel Core i5 2.7 GHz Processor, 8GB RAM and 128GB flash storage (SSD) – E-Apple Store
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
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
Buy 13-inch MacBook Pro - Apple
Best Buy: Apple MacBook Pro with Retina display (Latest Model) 13.3" Display 8GB Memory 512GB Flash Storage Silver MF841LL/A