iMac | 2.66 GHz Core 2 Duo | 20 Inch | Early 2008 - Techable.com
OWC 6GB (2GB + 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac Models at Amazon.com
6GB Kit 2GB & 4GB iMac Early 2008 A1224 A1225 MB324LL/A MB325LL/A Memory Ram | eBay
Memory Upgrades for Apple iMac 2008 - Up to 6GB
Apple iMac Mac OS X 10.11, El Capitan 2008 Apple Desktops & All-In-One Computers for sale | eBay
CMS 6GB (1X4GB) & (1X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - B117 at Amazon.com
6GB Memory Upgrade for 2009 MacBook and Early 2008 iMac
parts-quick 6GB (4GB + 2GB) Memory for Apple MacBook Pro, iMac 2007 2008 Compatible PC2-5300 667MHz DDR2 SODIMM at Amazon.com