Corsair CMV8GX3M2A1333C9 Value Select 4GB (2 x 2GB) 240-Pin DDR3 1333Mhz (PC3 10666) Desktop Memory Model at Amazon.com
New 8GB 2X4GB DDR3-1333 PC3-10600 Memory for Laptop RAM at Amazon.com
8GB G.Skill DDR3 PC3-10666 1333MHz Ripjaw Series CL9 (9-9-9-24) Dual Channel kit at Amazon.com
A-Tech 4GB 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 Module at Amazon.com