Early 2009 model iMac Computer, DDR3 8GB (2x4GB) RAM Replacement - YouTube
4B (1X4GB) RAM Memory for Apple iMac "Core 2 Duo" 3.06 21.5-Inch (Late 2009) A34 849005065276 | eBay
Memory Upgrades for Apple iMac 2009 - Up to 32GB
How to Upgrade iMac RAM (20" and 24" Aluminum): EveryMac.com
Install memory in an iMac - Apple Support
How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
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
OFFTEK 4GB Replacement Memory RAM Upgrade for Apple iMac 2.66GHz Intel Quad Core i5 - (27-Inch) (DDR3 - Late 2009) (DDR3-8500) Desktop Memory at Amazon.com
Memory Upgrades for iMac w/ Retina 5K Display Late 2015
iMac (2007-2009) Memory Installation Video - YouTube
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,
ram for late 2009 imac model | Newegg.com
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book, Mac Book Pro, iMac, Mac Mini (Late 2008, Early/Mid/Late 2009, Mid 2010) SODIMM Memory MAC RAM Upgrade