A-Tech 8GB 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
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
recommended ram for mid-2012 macbook pro - Apple Community
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
MacBook Pro: How to remove or install memory - Apple Support
Apple MacBook Pro 15" Retina Mid 2012, 8GB Ram, 250GB SSD Model A1398 EMC 2512 | eBay