8GB G.Skill DDR3 PC3-10666 1333MHz Ripjaw Series CL9 (9-9-9-24) Dual Channel kit at Amazon.com
A-Tech 8GB (2x4GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit 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