4GB Memory RAM for APPLE iMac Early 2008 Mid 2007 A1225 A1224 MB398LL/A MA876LL | eBay
Apple iMac 2008 4GB DDR2 800MHz PC2-6400 200-Pin Memory
for Apple 4GB Kit 2X 2GB DDR3 1067MHz 1066MHz PC38500 SODIMM Memory RAM Upgrade for MacBook MacBook Pro iMac Mac Mini Late 2008 Early 2009 Mid 2009 Late 2009 Mid 2010 Models - Newegg.com
4GB Kit Apple iMac (April 2008) Memory Upgrade 2 x 2GB (MB413G/A) DDR2 PC2-6400 SODIMMs at Amazon.com