OWC 6GB (2GB + 4GB) PC8500 DDR3 1066MHz SO-DIMMs Memory Compatible with Late 2008, Early 2009, Early 2010 MacBook, MacBook Pro Unibody Models, 2009/2010 Mac Mini, 2009 iMac Models at Amazon.com
iMac | 3.06 GHz Core 2 Duo | 27 Inch | Late 2009 - Techable.com
Install memory in an iMac - Apple Support
Apple iMac 21.5" late 2009 3.06GHz Core2Duo - some cosmetic damage - works great | eBay