4GB PC3-8500 RAM for Apple iMac Late 2009 - 21.5 Inch MB950LL/A Memory Upgrade Module
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
parts-quick 6GB Kit (4GB + 2GB) Memory for iMac 2008 Apple MacBook 2009 PC2-6400 800MHz DDR2 SODIMM at Amazon.com
Review: Apple's 27" big screen iMac (late 2009) | AppleInsider
Install memory in an iMac - Apple Support
4GB 2x2GB Memory Apple iMac Early 2009 Lat 2009 Core 2 Duo DDR3 1067 MHz RAM A47 | eBay
8GB -2x4GB Memory Ram Upgrade 27" Apple iMac 10.1 3.06GHz Core2Duo Late 2009 | eBay
Apple iMac 3.0Ghz Core 2 Duo 21.5-Inch (Late-2009) *No HDD/RAM* – MSU Surplus Store
iMac Early 2009 (20-inch and 24-inch) RAM Upgrade Dallas – Apple Mac Computer Repair Dallas , Laptop ,Desktop ,iMac ,MacBook iPhone iPad Data Recovery ,Virus
A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
iMac RAM for Model 11.2 to 12.2 | DDR3-1066MHz | 4GBx2 | MacMemory.com