Memory RAM Upgrade for Apple MacBook Pro 15-inch Mid 2012 4GB/8GB DDR3 SODIMM | eBay
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core I5 2.5 13" Mid-2012 - A7 at Amazon.com
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
16GB 2x8GB DDR3 1600MHz SO-DIMM Laptop Memory for Macbook Pro 13 "mid 2012 A1278 | eBay
How to Install Memory in a 13-inch MacBook Pro (Mid 2012) MacBookPro9,2 - YouTube
DDR3 1600MHZ PC3-12800 SODIMM for Apple iMac 2012 - 2013 (13,2 14,2)
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
MacBook Pro: How to remove or install memory - Apple Support
Timetec Hynix IC DDR3L 1600MHz PC3L-12800 SODIMM Compatible with Apple 2011, 2012, 2013, 2014 MacBook Pro, iMac, Mac mini (16GB Kit(2x8GB)) - Newegg.com
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com