CMS 4GB (1X4GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 2.4 20-Inch Early 2008 - A42 at Amazon.com
CMS 1GB (1X1GB) RAM Memory 4 Apple iMac "Core 2 Duo" 2.4 20-Inch Early 2008 - Walmart.com
Apple iMac 20-inch Early 2009 2.66GHz Intel Core 2 Duo (MB417LL/A) – UNICOM, Inc.
iMac Intel 24" Early 2008 EMC 2211 - used original spareparts for Macs
Apple iMac 20" Early 2008 A1224 2.4GHz 4 GB Ram 250 HD DVD WiFi - FREE SHIPPING | eBay
6GB Kit 2GB & 4GB iMac Early 2008 A1224 A1225 MB324LL/A MB325LL/A Memory Ram | eBay
A-Tech 8GB (2 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for MacBook, MacBook Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) | 204-Pin SODIMM Memory Kit at Amazon.com
Memory Upgrades for Apple iMac 2008 - Up to 6GB
20″ iMac (Early 2008) | Low End Mac
parts-quick 6GB Kit (4GB + 2GB) Memory for iMac 2008 Apple MacBook 2009 PC2-6400 800MHz DDR2 SODIMM at Amazon.com
iMac | 2.66 GHz Core 2 Duo | 20 Inch | Early 2008 - Techable.com
4GB -2x2GB Memory Ram Upgrade 20" Apple iMac-8.1 2.66GHz Core 2 Duo Early 2008 | eBay
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade
iMac Memory for Model 8.1 | DDR2-800MHz |4GB | MacMemory.com
Maximum RAM iMac early 2008 | MacRumors Forums
Apple iMac "Core 2 Duo" 2.66 20-Inch (Early 2008) , 320 GB Hard Drive, 2 GB RAM - Imagine41