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
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
iMac (2007-2009) Memory Installation Video - YouTube
iMac (Early 2008) RAM Upgrade - YouTube
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
Maximum RAM iMac early 2008 | MacRumors Forums
iMac Memory for Model 8.1 | DDR2-800MHz |4GB | MacMemory.com
Good Condition Apple iMac Early 2008, 250GB Storage, 5GB RAM, 2.4GHz | eBay