Komputerbay 16GB Dual Channel Kit 2x 8GB 204pin 1.35v DDR3-1600 SO-DIMM 1600/12800S (1600MHz, CL11) for MAC and PC at Amazon.com
OWC 12GB (8GB+4GB) PC3-12800 DDR3L 1600MHz SO-DIMM 204 Pin CL11 Memory Upgrade Kit Compatible with iMac, Mac Mini, and MacBook Pro (OWC1600DDR3S12S) at Amazon.com