A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Restored Apple MacBook Pro 15.4-Inch Laptop with Retina Display MGXA2LL/A, 2.2 GHz Intel Core i7, 16GB RAM, MacOS 10.0, 256GB SSD, Silver (Refurbished) - Walmart.com
Used 2017 Apple MacBook Pro 15.4" Core i7 2.8GHz 16GB RAM 256GB SSD MPTU2LL/A - Walmart.com
MacBook Pro: How to remove or install memory - Apple Support
How to upgrade the RAM on your 13-inch MacBook Pro