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-Spectek CT102464BF160B PC3-12800 8GB DDR3-1600 CL11 SODIMM 204PIN Single Memory Module at Amazon.com