8GB -2x4GB Memory Ram Upgrade 20" Apple iMac 9.1 2.66GHz Core 2 Duo Early 2009 | eBay
Memory Upgrades for Apple iMac 2009 - Up to 32GB
iMac (2007-2009) Memory Installation Video - YouTube
OWC 16GB (4 x 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with iMac 21.5" and 27" (October/2009) at Amazon.com
Can the Late 2009 27" iMac handle 32GB of RAM? | MacRumors Forums
Memory Upgrades for Apple iMac 2009 - Up to 32GB
Memory RAM Upgrade for Apple iMac 20-inch Early 2009 4GB DDR3 SODIMM | eBay
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
iMac (2009) RAM & Storage Upgrades
A-Tech for Apple 1GB DDR2 667MHz PC2-5300 200-pin SODIMM for MacBook, MacBook Pro, iMac, Mac Mini - (Early/Mid/Late 2006, Mid/Late 2007, Early 2008, Early 2009) - Memory RAM Module at Amazon.com
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM