16GB 2X8GB Memory RAM for Apple MacBook Pro MD103LL/A (15" Quad-core Intel Core i7 2.3GHz) 204pin 1600MHz PC3-12800 DDR3 SO-DIMM Black Diamond Memory Module Upgrade - Walmart.com
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com