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
DUOMEIQI 8GB Kit(2 X 4GB) Pc3-10600 1333Mhz ddr3 Sdram 2Rx8 Pc3 10600s Sodimm 204-Pin CL9 1.5V Pc3 10600 ddr3-1333 Pc3-10600S Non-Ecc Unbuffered for Laptop at Amazon.com
Amazon.com: Timetec 8GB Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) SODIMM MAC RAM Upgrade : Electronics