Amazon.com: Timetec 16GB KIT(2x8GB) 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) MAC RAM Upgrade :
XPG Premier 16GB Single DDR4 2666Mhz CL19 PC4-21000 260-Pin SODIMM Memory RAM Single (AD4S266616G19-SGN) at Amazon.com
Kingston Technology 4GB 1333MHz DDR3 Single Rank SODIMM for HP/Compaq Laptop KTH-X3BS/4G at Amazon.com
Crucial RAM 4GB DDR3 1333 MHz CL9 Memory for Mac CT4G3S1339M 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
Kingston Value RAM 4GB 1333MHz PC3-10600 DDR3 Non-ECC CL9 SODIMM SR X8 Notebook Memory (KVR13S9S8/4) at Amazon.com
PC3-10600 DDR3 1333 8GB Kit (2x4GB) RAM PC3 10600S 1333MHZ 2Rx8 204-pin 1.5v 4GB Memory Upgrade for Laptop at Amazon.com