4GB DDR3 1600Mhz Laptop Memory Ram+Cooling Vest SO-DIMM PC3 12800 DDR3L 1.35V Memoria Sdram for Laptop Notebook - Walmart.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
Silicon Power DDR3 (4GB) for PC3-12800s | PC3-12800 DDR3