Refurbished: Apple MacBook Pro 13-inch Mid 2012 - Intel Core i5-3210M 2.50 GHz - 4 GB RAM - 500 GB HDD - DVD-RW - OS X Mavericks (10.9) - Newegg.com
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 SODIMM PC3-12800 204-Pin SO-DIMM Memory Upgrade at Amazon.com
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
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
Macbook Pro 13 Inch Mid-2012 2.5 Ghz Intel Core i5 Laptop | Landshark Information Technology
Samsung ram Memory Upgrade DDR3 PC3 12800, 1600MHz, 204 PIN, SODIMM for 2012 Apple MacBook Pro's, 2012 iMac's, and 2011/2012 Mac Mini's (8GB kit (2 x 4GB)) at Amazon.com
Upgrading My MacBook Pro i5 (Mid 2012) With 16GB Memory - miapple.me - Tech.Blog