8GB (2 X 4GB) DDR3 1600MHz PC3-12800 240-pin Memory RAM DIMM Kit for Desktop PC by NEMIX RAM at Amazon.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
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
Total Micro 4GB DDR3 SDRAM 1600 MHz Memory Module 0A65723-TM at Amazon.com
Crucial 8GB Single DDR3L 1600 MT/s (PC3-12800) DR x4 RDIMM 240-Pin Server Memory CT8G3ERSLD4160B at Amazon.com