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
Apple iMac 20" Mid 2007 2.5GHz T9300 4GB 667MHz 500Gb OS 10-15-7 One Owner Boxed 885909150311 | eBay
24″ iMac (Mid 2007) | Low End Mac
Apple iMac 24" Desktop - MA878LL/A (August, 2007) for sale online | eBay
Memory Upgrades for Apple iMac 2007 - Up to 6GB
20" Apple iMac All in 1 Computer 2.26 GHz 8GB RAM 1TB Toshiba 7200 RPM HDD A1224 | eBay