G.Skill Ripjaws X Series 16 GB (2 x 8 GB) 240-Pin SDRAM (PC3-12800) DDR3 1600 CL10-10-10-30 1.50V Dual Channel Desktop Memory Model F3-12800CL10D-16GBXL at Amazon.com
OWC 16.0GB (4 x 4GB) 1333MHz 204-Pin DDR3 SO-DIMM PC3-10600 CL9 Memory Compatible with iMac (OWC1333DDR3S16S) at Amazon.com
Kingston Fury Beast Black 16 GB (2 x 8 GB) 1600MHz DDR3 CL10 Desktop Memory Kit of 2 KF316C10BBK2/16 at Amazon.com
Micron PC3-12800 (DDR3-1600) 8 GB Computer Memory (RAM) for sale | eBay