A-Tech for Apple 16GB Kit (2x 8GB) DDR3 1600MHz PC3-12800 204-pin SODIMM MacBook Pro (Mid 2012 13”/15”), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015, 21.5”/27”, Retina 5K) Memory RAM Upgrade at Amazon.com
OWC 16GB (2 x 8GB) PC8500 DDR3 Non ECC 1066 MHz 204 pin SO-DIMM Memory Module (OWC8566DDR3S16P), for 2010 MacBook Pro, MacBook, Mac Mini, and 2009 iMac - Newegg.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 (8GB kit ( 2 x 4GB )) - Newegg.com
OWC 8GB PC3-12800 DDR3L 1600MHz SO-DIMM 204 Pin CL11 Memory Module Upgrade Compatible with iMac, Mac Mini, and MacBook Pro (OWC1600DDR3S8GB) at Amazon.com
Corsair Apple Certified 16 GB (2x8 GB) DDR3 1600MHz (PC3 12800) Laptop Memory 1.35V at Amazon.com