2GB Apple iMac Early 2008 20-inch MB323LL/A Memory RAM | eBay
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
SOLD - 2008 24" iMac - $245 - Denver Mac Repair
Install memory in an iMac - Apple Support
iMac Performance (May 2008)
2GB DDR2 800MHz RAM Memory Upgrade for Apple iMac Core 2 Duo 24-inch (Early 2008) (PARTS-QUICK) - Walmart.com