HP VH641AT 4-GB DDR3 RAM (PC3-10600 , 1333 MHz) at Amazon.com
Amazon.com: HRUIYL Compatible for Apple DDR3 1333MHz 4GB PC3-10600 DDR3 Laptop ram 4GB Memory for MacBook Pro, iMac, Mac Mini (DDR3 1333 4GB, Green 4GB RAM) : Electronics
Crucial RAM 4GB DDR3 1333 MHz CL9 Memory for Mac CT4G3S1339M at Amazon.com
Kingston Technology 4GB 1333MHz DDR3 Single Rank Laptop Memory M51264J90S at Amazon.com
Kingston 4GB 1333MHz DDR3 DIMM Memory For Select Dell Desktops at Amazon.com
Transcend DDR3 1333MHz Notebook SO DIMM Memory Module - 4GB at Amazon.com
4GB (1x4GB) DDR3-1333MHz PC3-10600 2Rx8 SODIMM Laptop Memory by NEMIX RAM 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
4GB (1x4GB) DDR3-1333MHz PC3-10600 2Rx8 SODIMM Laptop Memory by NEMIX RAM at Amazon.com