8GB -2x4GB Memory Ram Upgrade 21.5" Apple iMac 10.1 3.06GHz Core2Duo Late 2009 | eBay
Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
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
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
Apple iMac 21.5-inch Late 2009 3.06GHz Intel Core 2 Duo (MB950LL/A) – UNICOM, Inc.
A-Tech for Apple 4GB Kit (2X 2GB) DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM
Benefits from RAM upgrade to Late 2009 iMac | MacRumors Forums
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
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Apple iMac Late 2009 All in One Pc i7 16gb Ram 2TB HHD 2.8gz Selling as Is | eBay