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
IBM 4GB 1X4GB PC3L-10600 CL9-ECC DDR3 1333 Memory Module LP RDIMM at Amazon .com