Kingston Technology 16GB Non-ECC CL11 DIMM 1600MHz DDR3 RAM (KVR16N11K2/16) - Kit of 2 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
Crucial 16GB 2 x 8 GB DDR3 SDRAM Memory Kit 16 GB 2 x 8GB DDR3 1600PC3 12800 DDR3 SDRAM 1600 MHz CL11 1.35 V Non ECC Unbuffered 204 pin SoDIMM Lifetime Warranty - Office Depot