Amazon.com: OWC 4GB (2 x 2GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008 - Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac, Late 2009 MacBook 13" : Everything Else
Apple iMac 2009 (Late) 27-inch 2K (iMac 11,1) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre
iMac (2009) RAM & Storage Upgrades
NEMIX RAM 4GB (1X4GB) DDR3 1066MHZ PC3-8500 MacBook Pro (Late 2006 - Late 2008) Pre-unibody iMac (Early & Mid 2009) iMac (Late 2009) MacBook Pro (Late 2008 - 2010) Compatible Memory at Amazon.com
DDR3 RAM for Late 2009 iMac | MacRumors Forums
Install memory in an iMac - Apple Support
Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for
Memory Upgrades for Apple iMac 2009 - Up to 32GB
Apple iMac 2.6Ghz i5-750 27-Inch (Late-2009) *NO HDD/RAM* – MSU Surplus Store
A-Tech 4GB PC3-8500 DDR3 1066/1067 MHz RAM for MacBook, MacBook Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) | 204-Pin SODIMM Memory Upgrade Module at Amazon.com
iMac (2007-2009) Memory Installation Video - YouTube
Apple iMac 21.5" 3.06GHz Intel Core 2 Duo 8GB DDR3 Ram 500GB HDD Late 2009 | eBay
Apple iMac Late 2009 All in One Pc i7 16gb Ram 2TB HHD 2.8gz Selling as Is | eBay