DOLGIX 8GB (2 x 4GB) DDR3 1600MHz PC3-12800 Laptop RAM Kit Non-ECC Unbuffered SODIMM 1.35V 204-Pin Memory 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