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
Kingston 4GB 1333MHz DDR3 DIMM Memory For Select Dell Desktops at Amazon.com
Crucial RAM 4GB DDR3 1333 MHz CL9 Memory for Mac CT4G3S1339M at Amazon.com