Amazon.com: Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac (Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) RAM Upgrade : Electronics
Kingston Technology 8GB (1x8 GB) 1333MHz DDR3 PC3 10600 204-Pin SODIMM Memory for Apple iMac KTA-MB1333/8G at Amazon.com
G.Skill 8GB DDR3 PC3-10600 1333MHz CL9 NT Series Desktop dual channel memory kit (2x4GB) at Amazon.com