Samsung 16GB (2 x 8GB) 204-pin SODIMM, DDR3 PC3L-12800, 1600MHz ram Memory Module for laptops (M471B1G73EB0-YK0 x 2) at Amazon.com
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 (16GB kit (2 x 8GB)) System Specific Memory - Newegg.com
Samsung 16GB (2 x 8GB) 204-pin SODIMM, DDR3 PC3L-12800, 1600MHz ram Memory Module for laptops (M471B1G73EB0-YK0 x 2) at Amazon.com