iMac (2007-2009) Memory Installation Video - YouTube
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
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
Memory - Apple Mac - iMac - 2007 iMac - Mid-2007 - iMac7,1 - Flexx memory
Timetec Hynix IC 8GB Compatible for Apple DDR3 PC3-8500 1067MHz /1066MHz SODIMM Memory Upgrade for MacBook 13 Mid 2010, MacBook Pro 13 Mid 2010, iMac 27Late 2009, Mac Mini Mid 2010 (8GB) - Walmart.com
Memory Upgrades for Apple iMac 2007 - Up to 6GB
Install memory in an iMac - Apple Support
2GB DDR2-667 (PC2-5300) RAM Memory Upgrade for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
4GB 2 X 2GB DDR2 Memory for iMac 7,1 Mid 2007 20" inch 24" inch Intel Core 2 Duo 2.4GHz PC2-5300 667MHz 200 pin SODIMM (PARTS-QUICK) at Amazon.com