6GB (4GB & 2GB SODIMM Upgrade Kit) DDR2-800 for Apple iMac 2008 Core 2 Duo 8,1 System Specific Memory - Newegg.com
A-Tech for Apple 6GB Kit (1x2GB + 1x4GB) DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook (Late 2007, Early 2008, Early 2009), MacBook Pro (Mid 2007, Early 2008), iMac (Mid 2007) - Memory RAM Upgrade at Amazon.com