Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 RAM for Mac Book (Mid 2010 13-inch), Mac Book Pro (Mid 2010 13-inch), iMac (Late 2009 27-inch), Mac Mini (Mid 2010)
8GB -2x4GB Memory Ram Upgrade 21.5" Apple iMac 10.1 3.06GHz Core2Duo Late 2009 | eBay
Apple iMac 21.5 2009 3.06Ghz UPGRADE 8GB-RAM 1TB-HDD DVD OS10-15-7 One-owner Box | eBay
iMac | 3.06 GHz Core 2 Duo | 21.5 Inch | Late 2009 - Techable.com
Review: Apple's 27" big screen iMac (late 2009) | AppleInsider
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Timetec 16GB KIT(4x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 Dual Rank for iMac (Late 2009 21.5-inch / 27-inch) SODIMM Memory MAC RAM Upgrade for iMac 10,1 and iMac 11,1 at Amazon.com
Install memory in an iMac - Apple Support
Memory Upgrades for Apple iMac 2009 - Up to 32GB
Install memory in an iMac - Apple Support
A-Tech 16GB (4 x 4GB) PC3-8500 DDR3 1066/1067 MHz RAM for iMac Late 2009 21.5-inch / 27-inch | 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
Install memory in an iMac - Apple Support
Apple iMac A1311 21.5" Desktop - MB950LL/A (October, 2009) for sale online | eBay
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core 2 Duo 3.06 21.5-Inch (Late 2009) - A35 at Amazon.com
How to Upgrade/Install Memory in a 21.5-inch iMac (Mid 2017) iMac18,1 iMac18,2 - YouTube
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube