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
8GB DDR3 SDRAM Memory Module at Amazon.com
Amazon.com: Yongxinsheng DDR3 4GBx2 (8GB Kit) 1600MHz PC3-12800 Desktop Memory CL11 240Pin 1.5V Non-ECC Unbuffered Compatible with All Motherboards UDIMM Ddr3 RAM - Black : Everything Else