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
A-Tech 4GB Replacement for Kingston KTD-L3BS/4G - DDR3 1333MHz PC3-10600 Non ECC SO-DIMM 1rx8 1.5v - Single Laptop & Notebook Memory Ram Stick (KTD-L3BS/4G-ATC) at Amazon.com